The Holes in AUKUS and the Australian Defence Plan

The plan is built around a contingency involving Australia's largest trading partner. No public document prices that decision.

Two-way trade with China was $326 billion in 2025, a quarter of all Australia's trade. Exports were $196 billion, 29 per cent of everything Australia sells. The remaining $130 billion is what Australia buys: electrical and electronic equipment, machinery, vehicles, fabricated steel and plastics, which are the inputs to almost everything Australia builds and have been a structural source of disinflation for two decades.

The 2020 coercion episode, the only demonstrated case, cost about $20 billion a year in targeted exports. A full cut-off has been assessed by this party at roughly 6 per cent of GDP, which is over $4 trillion across the thirty years the submarines take to arrive. No Commonwealth assessment of any of it has been published, by Treasury, the Productivity Commission or the Defence Strategic Review. That range has never been narrowed because nobody has attempted it.

Read more: The AUKUS Cost BlowoutReferences[13] China country brief Department of Foreign Affairs and Trade, Commonwealth of Australia[14] The economics of AUKUS Lowy Institute

No navy has reopened a closed sea lane. Three have closed in three years, and none was reopened by force.

ANZUS commits the parties to consult, not to fight. But willingness is the smaller problem: what Australia needs protected cannot be protected by a fleet.

Modern conditions decide it. Anti-ship missiles, cheap one-way drones and mines are launched from shore against ships that are radar-bright, slow and broadcasting their own position, and the cost of the weapon is a fraction of the cost of the interception. Hormuz, the Red Sea and the Black Sea have each closed on that arithmetic.

Commercial withdrawal is one of the mechanisms, not the cause. At Hormuz in February 2026 premiums rose fivefold and cover was re-quoted at about sixty times pre-crisis rates within 48 hours, before a mine was laid; the Lloyd's Market Association says safety rather than insurance drove it. Either way the decision was commercial. Red Sea transits fell 90 per cent with a United States carrier group present.

Read more: The Proof of the Hormuz Pudding, The Island Castle, and The True Cost of Cheap Imported FuelReferences[15] The Insurance Weapon: How Commercial Risk Logic Became an Irregular Warfare Tool at Hormuz Irregular Warfare Initiative, June 2026[16] Safety concerns, not insurance availability, driving reduced vessel traffic in the Strait of Hormuz Lloyd's Market Association, market statement, 23 March 2026[17] Middle East shipping insurance costs rise on Hormuz risks S&P Global Commodity Insights, July 2026[18] Security Treaty between Australia, New Zealand and the United States of America, [1952] ATS 2 Australian Treaty Series, via AustLII

Delivery runs into the 2050s. The plan assumes four decades of aligned politics across three countries.

Eight submarines are to be in Australian service by the 2050s, a schedule spanning a dozen governments in three democracies. The treaty record does not support that assumption.

ANZUS, in force since 1952, commits the parties to consult when security is threatened, and to act to meet a common danger in accordance with their constitutional processes. It creates no obligation to fight, no integrated command and no assigned forces. It has been formally invoked once, by Australia in 2001, to join a war the United States was already fighting. New Zealand has been partially suspended since 1986 over a nuclear policy dispute, which is the demonstrated case that a party can be removed from the arrangement over exactly the kind of question AUKUS raises. One partner is currently reviewing the agreement against an America First test.

Read more: category EReferences[18] Security Treaty between Australia, New Zealand and the United States of America, [1952] ATS 2 Australian Treaty Series, via AustLII[19] Force Posture Agreement between Australia and the United States of America, [2015] ATS 1 Australian Treaties Database, Department of Foreign Affairs and Trade[20] The ANZUS Treaty United States Studies Centre, University of Sydney

The force is built for a shooting war. The demonstrated vulnerability is a supply one, and it is unassessed.

The Review rejects a "balanced force" able to meet a range of contingencies in favour of a "focused force" designed against one military threat. That is a choice about the kind of war as much as the opponent.

Australia imports more than 90 per cent of its medicines and about 90 per cent of its liquid fuel, and roughly 98 per cent of its trade moves on foreign-owned or foreign-controlled shipping. Two refineries remain, from eight in 2005, meeting under a fifth of demand. Diesel reserves have been reported at 22 days against an International Energy Agency obligation of 90. There is no mandated minimum stockholding of medicines and no public figure for what stock exists.

A Commonwealth body is charged with exactly this. The Office of Supply Chain Resilience covers fuel, pharmaceuticals, semiconductors, fertilisers and telecommunications equipment, and names national security in its remit. Yet a 2026 expert roundtable found Australia's supply chains long, opaque and heavily import-dependent, with no comprehensive national risk or vulnerability assessment mapping those dependencies. The country is armed for one kind of attack and exposed to another.

Read more: The Island Castle, The Proof of the Hormuz Pudding, and The True Cost of Cheap Imported FuelReferences[2] Release of the Defence Strategic Review Minister for Defence, 24 April 2023[25] The defence strategic review: a revolution in Australian defence planning? Australian Strategic Policy Institute[26] Office of Supply Chain Resilience Department of Industry, Science and Resources, Commonwealth of Australia[27] Submission on the implications of the COVID-19 pandemic for Australia's resilience Institute for Integrated Economic Research Australia, to the Australian Parliament[28] Five important ways to reduce Australia's supply chain risks UNSW BusinessThink, University of New South Wales, 2026[29] Australia's fuel security falling short as war-game report, released under FOI, reveals vulnerabilities ABC News[30] The escalation trap is exposing Australia's economic vulnerability Australian Institute of International Affairs, March 2026

The plan assumes eight boats threatening China's sea lanes will deter. China has spent two decades preparing for exactly that.

The reasoning is that a long-range submarine force puts Chinese shipping at risk and so buys Australia a say. Beijing named that vulnerability in 2003 and has worked on it since: strategic reserve construction from 2007, pipelines from Kazakhstan, Russia and Myanmar, and the Belt and Road corridors. Overland now carries about a tenth of Chinese oil imports, from nothing before 2006.

This has not solved China's problem: roughly 80 per cent of its crude still transits Malacca. But the comparison is what matters. China holds a reserve measured in months, fourteen land neighbours and the world's largest refining industry. Australia holds about 30 days and no land neighbour. A blockade of China is measured in years; Australia's endurance in weeks.

And the lane runs both ways. Australia's own refined fuel arrives through those same waters, from Singapore, South Korea, Japan and Malaysia. Closing the strait closes it on Australia first.

Read more: The Island Castle and How China Held the World UpReferences[34] China's Malacca Dilemma, After the Hormuz Blockade Foreign Policy, May 2026[35] Internal Energy Balancing and the Coercive Isolation of Taiwan China Journal of Foreign Policy[36] Strait of Malacca: Asia's oil lifeline and China's weak spot GEOPOL, May 2026

Mines, uncrewed systems and land-based missiles are already funded and arriving. No published analysis compares them with the submarines.

The alternatives are not hypothetical. Australia has committed $1.1 billion to dozens of Ghost Shark autonomous undersea vehicles, with first delivery in 2026. Bluebottle uncrewed surface vessels are on order in the dozens. Sea mines, land-based anti-ship missiles on trucks, and Tomahawk and SM-6 on the destroyers are all in train. Each arrives years before the first submarine, and can be bought in numbers.

The government's position is that these complement the submarines rather than replace them. That may be right. What has never been published is the comparison — what the same $368 billion buys in mines, uncrewed systems, land-based strike and stores, measured against eight boats arriving from 2032. A different pathway was also available and unexamined in public: the French Suffren class, cheaper, with a crew of about 65 rather than 100 or more, and a reactor that can be refuelled rather than a sealed life-of-boat core.

Read more: Sub to Nowhere and The Island CastleReferences[40] Security without submarines: the military strategy Australia should pursue instead of AUKUS University of New South Wales, April 2025[41] Distributed firepower: attack missile boats are alternatives to major warships ASPI The Strategist, February 2025[42] An alternative AUKUS path Australian Naval Institute[43] Australia to deploy fleet of underwater attack drones dubbed Ghost Sharks CBS News

Armed neutrality and non-alignment are live options in the literature and in the region. No Australian government document examines either.

The option is not fringe. Switzerland, Austria, Ireland and, in varying forms, Sweden and Finland have practised armed neutrality or military non-alignment. Singapore holds close defence relations with the United States and Australia while maintaining non-alignment, and sees no contradiction in it. Australian academic work has examined armed neutrality directly, and even institutes that support the programme acknowledge that the spectrum of deterrence options runs from neutrality to nuclear weapons.

What is missing is any assessment on the government's own record. There has been no white paper since 2016. The 2023 Review does not test non-alignment, armed neutrality or a regional security architecture as postures, and no departmental analysis of them has been released. The middle path was not rejected on the record. It was never examined on the record.

Read more: The AsiaPac Solution and From AUKUS to AUASIAReferences[50] The US alliance is precious, but Australia should plan for more self-reliance ASPI The Strategist, April 2025[51] Plan B? Reconsidering Australian security in the event of a post US alliance era Australian Journal of International Affairs[52] Advice to ASEAN: N should equal non-aligned, not neutral ASPI The Strategist, March 2024

The record says otherwise. The official American assessment found the blockade alone would have broken Japan without a single bomb on its cities.

The United States Strategic Bombing Survey is the definitive post-war assessment, and its finding is unambiguous. By August 1945, even without direct air attack on Japanese cities and industries, war production would have fallen 40 to 50 per cent below its 1944 peak solely through the interdiction of shipping. Oil imports began declining in August 1943 and had been eliminated by April 1945. By mid-1944 coal and ore imports were down two-thirds; by March 1945 coal had virtually ceased and iron ore was cut off entirely, with the remaining ships carrying food and salt. Aviation fuel stocks fell so low that pilot training and combat missions were cut.

Germany runs the same way. Fighter production peaked at 3,375 acceptances in September 1944, and only a minority reached combat, in part for want of fuel and pilots.

Read more: The Island CastleReferences[53] United States Strategic Bombing Survey: Summary Report, Pacific War, 1946 United States Government Printing Office[54] United States Strategic Bombing Survey: Summary Report, European War, 1945 United States Government Printing Office

Stirling is beyond land-based missile range. That has stopped mattering, because the launcher moves.

The case for Western Australia rests on geography: Perth sits roughly 7,000 kilometres from the Chinese mainland, outside the reach of the land-based systems that dominate the near seas. On land-based ranges alone that is true. It is also the wrong measure.

The Pentagon's assessment is that the Chinese navy will soon conduct long-range precision strikes against land targets from its submarines and surface combatants using land-attack cruise missiles. The Type 093B carries vertical cells for the CJ-10, range beyond 1,500 kilometres. A submarine does not need a 7,000-kilometre weapon, because it closes the distance itself, and finding one boat is the hardest task in naval warfare.

Above that sits a tier with no defence at all. Six Jin-class submarines have carried twelve JL-3 missiles apiece since 2022, with a range beyond 10,000 kilometres, from patrol areas near China. Nothing Australia buys alters that. Only not being a target does.

Read more: The Island CastleReferences[61] Type 093B: China could soon have a fleet of guided missile nuclear submarines The National Interest[62] China submarine capabilities Nuclear Threat Initiative[63] China to expand its nuclear submarine fleet as production of the Type 093B increases Army Recognition, February 2025[64] China deploys new submarine-launched ballistic missiles Arms Control Association, May 2023[65] United States officially recognises the Type 094 Jin-class submarine as China's first credible naval nuclear deterrent Army Recognition, March 2025

Korea, Vietnam, Afghanistan, Iraq. None arose from a threat to Australia. The record runs one way.

The mechanism has a name and its architects used it openly. It is the insurance model: pay the premium by fighting alongside the larger ally, and the ally will help in a time of need. Menzies invoked it explicitly in going into Vietnam. A commentator writing in a defence institute's own journal puts it plainly, that Australia invites itself to America's wars in order to pay its alliance dues.

The measure of what that has bought is the ally's own. An American scholar describes Australia as a very good ally precisely because it has sent troops to Korea, Vietnam, Iraq and Afghanistan despite the absence of a clear and present danger to Australia itself. Australia has been attacked once in its history. It has fought in nine wars since Federation, and the premium has never yet been claimed.

Read more: category DReferences[69] Cabinet papers reveal Australia was on path to war in Iraq in 1998 Graeme Dobell, ASPI The Strategist[70] The origins of the ANZUS alliance Australian Journal of International Affairs[71] Dangerous proximity: the collapse of Australia's defences in a contested Asia Australian Foreign Affairs

Taiwan, the Philippines and Fiji supported it. Indonesia and Malaysia objected. Malaysia set conditions in waters the boats must transit.

Regional reaction split, and it split along lines that matter operationally rather than rhetorically. Taiwan's foreign ministry welcomed the steady advancement of AUKUS; the Philippines supported it; Fiji, which hosts the Pacific Islands Forum, backs it, and the Forum chair said he was reassured after American assurances.

Indonesia's foreign ministry recorded deep concern at the continuing arms race and power projection in the region, and its director general for Asian, Pacific and African affairs wrote that Australia, as the first Non-Proliferation Treaty state party to build nuclear-powered submarines, may set a dangerous precedent. Malaysia's prime minister called the arrangement a catalyst towards a nuclear arms race, and Malaysia has since required that AUKUS observe its policy on the operation of nuclear-powered submarines in Malaysian waters, along with the Law of the Sea Convention and the Southeast Asian Nuclear Weapon-Free Zone.

Those are the archipelagic waters between the Indian Ocean and the South China Sea. No published Australian assessment addresses what compliance with that requirement would mean for transit.

Read more: category CReferences[72] Southeast Asian Responses to AUKUS: Arms Racing, Non-Proliferation and Regional Stability William Choong and Ian Storey, ISEAS Perspective 2021/134[73] ASEAN responses to the AUKUS security dynamic East Asia Forum, November 2021[74] The AUKUS Announcement and Southeast Asia ISEAS Perspective 2023/23[75] Why China Should Worry About Asia's Reaction to AUKUS RAND Corporation, April 2023[76] Pacific Responses to AUKUS a Mix of Unease and Understanding The Diplomat, April 2023

Eight hulls are counted as eight. On Australia's own cycle, six boats yield two deployable, for the world's third largest maritime zone.

Under the usage and upkeep cycle introduced after the Coles review, six Collins boats give two in long-term maintenance, three consistently available for tasking and two consistently deployable. Defence has told parliamentary committees it achieves that model. At the same ratio, eight nuclear boats return two or three at sea. Australia's exclusive economic zone is about 8.2 million square kilometres, the third largest in the world.

Both partners are performing worse than that, not better. The United States Government Accountability Office reported in August 2026 that maintenance backlogs cost the American attack submarine fleet about 15,000 operational days between 2016 and 2025 — some 41 years of submarine time — at about $3.4 billion, with a further 15 boats entering idle time to 2030. The United States Naval Institute has put the share of attack submarines out of service at around 40 per cent. British attack submarine availability reached zero in 2026.

The headline figure of eight is a procurement count. No published Australian document converts it into boats at sea.

Read more: category KReferences[79] US and UK partners show the realities facing Australia's small submarine fleet Baird Maritime, April 2026[80] British attack submarine availability falls to zero per cent as maintenance issues worsen Military Watch Magazine, June 2026[81] Collins class sustainment listed as a Product of Concern Minister for Defence Industry, 13 December 2024[82] Navy Readiness: Actions Needed to Address Costly Attack Submarine Maintenance Delays and Idle Time, GAO-26-109256 United States Government Accountability Office, August 2026[83] Forty per cent of US Navy nuclear attack submarines are out of service National Security Journal, April 2026, citing the United States Naval Institute

The Review sets an urgent period of 2023 to 2025. The submarines contribute nothing to it, or to the one after.

The judgement is bipartisan and has been restated at every step. The 2020 Defence Strategic Update found that the ten-year warning assumption was no longer an appropriate basis for planning. The 2023 Review found that in a missile age Australia can rely on neither geography nor warning time, and that the force was not fully fit for purpose. The 2024 National Defence Strategy repeated that Australia no longer enjoys a ten-year window of strategic warning.

The Review then divided its work into three periods: 2023 to 2025 for matters which must be addressed urgently, 2026 to 2030, and 2031 and beyond.

The submarines deliver nothing in the first period and nothing in the second. The first transferred boat is due in 2032 and the first built in Australia in the 2040s. The programme that consumed the Review's first priority is scheduled entirely inside its third period, and the 2016 white paper it replaced had predicted no major threat before 2040.

Read more: category QReferences[92] Launch of the National Defence Strategy and Integrated Investment Program Minister for Defence, 17 April 2024[93] Australia is entering the missile age and is no longer protected by its geography, defence review says ABC News, 24 April 2023[94] Australia's Defence Strategic Review signals radical changes Australia India Institute, University of Melbourne, May 2023

Australia has committed to disposing of spent naval fuel here, having never sited a facility for low-level waste in fourteen years of trying.

The commitment is explicit. Australia has undertaken to manage all radioactive waste generated by the programme, including spent nuclear fuel, in Australia. Each reactor compartment weighs over 100 tonnes and contains about 200 kilograms of highly enriched uranium, which is weapons-grade material; released documents describe a reactor compartment as roughly the size of a four-wheel drive and the spent fuel as roughly the size of a small hatchback. Three boats yield about 600 kilograms of it.

Against that stands the record. Australia has no national facility for radioactive waste. Waste is held at more than a hundred sites, Lucas Heights is nearing capacity, and the site-selection process for a national facility has run since legislation passed in 2012 without producing one. That facility, if built, would permanently dispose only of low-level waste and temporarily store intermediate-level waste, which would later move to a deep geological facility that does not exist.

The high-level facility was announced on 14 March 2023, the day of the submarine announcement, as a fait accompli on a remote site. Defence says storage will not be required until the mid-2050s. The obligation is dated. The site is not.

Read more: category OReferences[107] Australia hasn't figured out low-level nuclear waste storage yet, let alone high-level waste from submarines The Conversation[108] Where will Australia store its nuclear waste? ASPI The Strategist[109] Radioactive waste disposal and storage Australian Radiation Protection and Nuclear Safety Agency[110] Australia is not prepared for AUKUS submarines' nuclear waste Interesting Engineering, reporting documents released under freedom of information

The Review says the submarines are key to a strategy of denial. Its supporters say the mechanism is under-specified.

The stated rationale is a sentence. The Review holds that the acquisition is key to effecting a strategy of denial and to the provision of anti-submarine warfare and long-range strike options. It does not say which actions, in which places, the boats would deny.

Those making the case for the programme have said so. Academic assessment describes the question of how the submarines contribute to denial as under-specified. A defence institute writes that the strategy of denial lacks the precision needed to guide investment or convey clear thresholds, and that the behaviours to be stopped need defining first. A United States service journal warns against treating planned capabilities as inherently deterrent without sufficient strategic rationale, and finds substantial gaps in Australian strategy that undermine the credibility of the posture.

The sharper objection is that the capability does not match the strategy. Long range, endurance and stealth suit deterrence by punishment rather than denial. Punishment against a great power would require strikes on its mainland, and the Pentagon's own assessment records that it has effective defences against them.

Read more: category GReferences[115] AUKUS, the Defence Strategic Review and Australia's quest for deterrence University of Technology Sydney[116] Australia and deterrence: dazed and confused Lowy Institute, March 2024[117] AUKUS and deterrence: what, exactly, are we trying to deter? ASPI The Strategist, May 2025[118] The role of deterrence in Australian strategic thought Journal of Indo-Pacific Affairs, United States Air University, September 2024

The United States intelligence community does not describe China the way the Australian plan does.

The 2026 Annual Threat Assessment of the United States Intelligence Community, published in March and summarising eighteen agencies, records that China is prioritising a productive and stable economic relationship with the United States and will seek to reduce tension where that serves its interests. It assesses that Chinese leaders do not currently plan an invasion of Taiwan in 2027, have no fixed timeline for unification, prefer to achieve it without force, and recognise that an amphibious invasion would be extremely challenging with a high risk of failure. No Australian document reconciles the plan’s premise with that assessment.

References[12] Australia appears confused about its place in the global world order Laura Tingle, ABC News, 5 September 2026

A loaded tanker is slow, unarmoured, radar-bright and broadcasts its own position. Escorting does not fix that.

The assumption beneath the plan is that shipping can be defended if a navy is present. The 2026 record says otherwise, and the admission comes from inside the alliance. An American defence institute has written that the Navy cannot escort commercial shipping through the Strait of Hormuz at scale, and that when the largest maritime power on earth cannot keep the most critical strait open during a conflict, something fundamental has broken. The Chairman of the Joint Chiefs has said missiles, not mines, are now the largest threat to merchant shipping there.

Researchers at a Singapore defence institute reached the same conclusion: a navy-escorted convoy through Hormuz is very complex and offers limited protection, because air defence, counter-drone, anti-small-boat and mine detection would all be required at once. Outside the strait the risk continues for as long as a ship is within missile range. Russia's answer has been armour plating, sandbags and anti-drone mesh fitted to merchant hulls.

Read more: The Island Castle and The Proof of the Hormuz PuddingReferences[31] Dire Straits: Mines, Missiles, Drones, and the Autonomy Gap American Enterprise Institute, March 2026[32] Why convoys cannot fully protect oil tankers from Iran attacks Digital Journal, March 2026[33] Cages, convoys and coastal routes: Russian shipping adapts to drone threat Splash247, August 2026

Every alternative under discussion is a weapon. Stores, refining and domestic manufacture are treated as another portfolio.

The debate over what else the money could buy has been conducted entirely in munitions. Missiles, mines, uncrewed vessels and aircraft are argued about; the things that decide whether a country can hold out are not.

The proportions show it. The submarine programme is $368 billion. The Australian Fuel Security and Resilience package announced in May 2026 is $14.8 billion, about four per cent of it, and it is the largest commitment of its kind Australia has ever made. Until then Australia was among the only members of the International Energy Agency with no government-held fuel reserve at all. Within that package, $10 million is allocated to feasibility studies for new and expanded domestic refining.

No document sets the two against each other as competing ways of buying security. They are not even scored on the same page.

Read more: The Island Castle and The True Cost of Cheap Imported FuelReferences[44] Government action Fuel Plan, Commonwealth of Australia[45] Government securing more fuel reserves: the Australian Fuel Security and Resilience package Prime Minister of Australia, 6 May 2026[46] More than $10 billion slated to boost fuel supplies and emergency stockpiles ABC News, 6 May 2026

A country with no navy destroyed a third of Russia's Black Sea Fleet using drones costing about $200,000 each.

Ukraine lost most of its navy in February 2022. By early 2026 its defence ministry assessed that roughly 30 per cent of the Black Sea Fleet had been destroyed or seriously damaged, and one academic assessment puts the loss of effective capability nearer 40 per cent. Within a year of entering service, MAGURA V5 uncrewed surface vessels alone accounted for eight Russian warships destroyed and six damaged. The fleet withdrew from Sevastopol to Novorossiysk.

The counterweight belongs here. Those strikes tailed off through 2025 as Russia adapted with nets, dispersal, helicopter patrols and close-in defence, and cheap boats do not replace anti-ship missiles. Cheap mass denies a sea; it does not command one. That is the point. Denial in its own approaches is what Australia requires, and no published document tests eight submarines against it.

Read more: The Island Castle and Sub to NowhereReferences[47] Swarm at Sea: Autonomous Naval Drones and the Erosion of Maritime Deterrence Georgetown Security Studies Review, April 2026[48] How Ukraine beat Russia in the Black Sea TIME[49] A game of drones: the economics of cheap mass Sentinel Intelligence

Landing craft, frigates and submarines project force outward. The vulnerability being described is at home.

The reorientation is documented and deliberate. The Army established a Littoral Manoeuvre Group in March 2026, is taking 18 medium and eight heavy landing craft under contracts including one worth $4 billion, and describes itself as transforming to optimise for littoral manoeuvre paired with long-range strike. The amphibious combined-arms land system is funded at $48 to $59 billion, the third largest capability priority in the 2026 Investment Program. Analysts read the result as a force configured to project presence into and through the near region rather than to defend the continental landmass.

Two plans are running at once. One buys reach: submarines, frigates, landing craft, strike. The other is the country's actual exposure, which is fuel, medicine, shipping and stores. No published document reconciles them, or says which is to be preferred if the money runs short.

Read more: The Island CastleReferences[55] New landing craft to boost littoral defence Department of Defence, Commonwealth of Australia, February 2026[56] Australia's 2026 National Defence Strategy: what Canberra is actually prioritising Second Line of Defense, April 2026[57] Australian naval shipbuilding at the Henderson Defence Precinct Naval News, July 2026

Iran shows the shape. Strikes in February, and six months later the tankers are still being hit.

Major combat operations against Iran began on 28 February 2026. What followed was not a decision but an attrition. An American aerial campaign opened on 19 March to reopen the Strait of Hormuz; a naval blockade was imposed on 13 April; escorted convoys ran from May; negotiations began in June. Iran struck at least thirteen commercial vessels in August, one attack killing two seafarers. In September the United States began striking Iranian tankers in retaliation for attacks on shipping, a policy officials described as tanker for tanker.

Some of it worked. Transits recovered toward seven million barrels a day by late August, and the strait was never fully closed. That is the point. Six months of strikes, blockade and escort produced a contested waterway rather than a settled one, and the shipping is still being hit.

Read more: The Proof of the Hormuz Pudding and The Island CastleReferences[66] US and Iran trade strikes in the Strait of Hormuz USNI News, 4 September 2026[67] US strikes Iranian oil tankers for the first time in retaliation for Hormuz attacks Axios, 2 September 2026[68] Iran tightens grip on the Strait of Hormuz as shipping is forced into controlled routes HSToday, 2026

Canada chose twelve conventional boats for about a quarter of the cost, with the first four due in 2034.

On 6 July 2026 Canada selected the German Type 212CD as preferred supplier for up to twelve conventionally powered submarines, replacing four Victoria-class boats of which one remains seaworthy. The programme is put at 20 to 30 billion Canadian dollars for the boats and 70 to 80 billion over about thirty years including operations, maintenance and support. The first four are wanted by 2034 and the contract is to be concluded by the end of 2027. South Korea's Hanwha, offering a boat already in production with vertical launch tubes, remains the reserve option.

The comparison is not like for like and the register says so. A conventional boat must snort to charge, is slower in transit, and is limited by fuel and crew rather than by a reactor. Canada's requirement is Arctic and North Atlantic patrol; Australia's is long-range operations far from home.

What is comparable is the arithmetic on the same basis. Both figures cover about thirty years including sustainment. Canada expects twelve boats for the equivalent of roughly ninety billion Australian dollars, with four in the water by 2034. Australia expects eight for $368 billion, with the first transferred in 2032 and the fleet complete in the 2050s.

Australia did not run that comparison. Canada ran it in eighteen months, against five bidders.

Read more: category RReferences[104] Canada selects German firm to build 12 attack boats for Royal Canadian Navy USNI News, 8 July 2026[105] Canada selects the Type 212CD: what the $86 billion industrial package actually involves Quwa, July 2026[106] Canada picks Germany's TKMS for historic submarine buy Defense News, 7 July 2026

AUKUS was announced in September 2021. The strategic review that justifies it arrived nineteen months later.

AUKUS was announced on 15 September 2021. The Defence Strategic Review was commissioned in the first hundred days of the following government and released on 24 April 2023.

The last Defence White Paper was 2016. None preceded the largest defence decision in Australian history.

Australia's practice had been to set force structure through published white papers open to submissions and debate. No white paper was produced between 2016 and the 2021 announcement.

References[2] Release of the Defence Strategic Review Minister for Defence, 24 April 2023

The 2023 Review's first priority action is acquiring the submarines already announced. It could not conclude otherwise.

The government's response to the Review identifies six priority areas for immediate action. The first is the acquisition of nuclear-powered submarines through AUKUS — a decision taken eighteen months before the Review reported.

References[2] Release of the Defence Strategic Review Minister for Defence, 24 April 2023

In June 2026 the Defence Minister defended the programme as the conclusion of that review.

An opinion piece published on 22 June 2026 states that a clear-eyed assessment points to this being the best path forward, and that this was the conclusion of the 2023 Defence Strategic Review. The Review was given the decision to justify.

No tender, no published options analysis, no competing proposal assessed against the one chosen.

The preceding French programme was terminated. The replacement was selected through a trilateral government arrangement rather than a procurement process.

$368 billion has been committed. No business case for it has been released.

Major Commonwealth capital investment ordinarily proceeds through business case development and investment assurance before appropriation. No such document for the submarine programme is public.

Australia's Parliament has never held a substantial inquiry into the largest procurement in its history.

Parliament has examined instruments arising from the decision — the naval nuclear propulsion agreement was tabled on 12 August 2024, and the Australian Naval Nuclear Power Safety Bill was referred to the Senate Foreign Affairs, Defence and Trade committee. Those examined the safety legislation and the implementing agreement. No inquiry has examined the decision itself, the alternatives, or the cost.

References[1] Agreement for Cooperation Related to Naval Nuclear Propulsion Australia, United Kingdom and United States; tabled in the Australian Parliament 12 August 2024

The Commons Defence Committee inquired because AUKUS had received only limited parliamentary scrutiny. Australia's did not.

The House of Commons Defence Committee launched its inquiry in April 2025, held five oral evidence sessions between September and December 2025, and reported in April 2026. It found that the strategic priorities of the two countries do not align. The junior partner's legislature examined the deal; the country paying for it did not.

References[3] AUKUS House of Commons Defence Committee, United Kingdom Parliament, April 2026

The only public inquiry into the submarine pact is being paid for by subscription.

A public inquiry is being conducted on crowd-funded terms because no official equivalent exists.

Henderson gets a business case, appropriation and parliamentary scrutiny. Osborne does not.

The Henderson precinct is delivered through the ordinary federal capital-spending pathway. Osborne is not, because the delivery company is excluded under the Act by a legacy commercial-confidentiality exemption inherited from the Australian Submarine Corporation. $4.6 billion announced recently sits in that gap. Source: Australian Naval Institute and ASPI, July–August 2026.

The Pentagon is reviewing AUKUS against an America First test. Who, when and why were not stated.

The review was announced to ensure the initiative aligns with the President's America First agenda. The department did not say who was conducting it, when it would conclude, or why it was initiated.

No election, referendum or parliamentary vote preceded the commitment.

The decision was taken by the executive. Treaty-making in Australia does not require parliamentary approval, and none was sought before the announcement.

Under Rarotonga Australia must prevent stationing of nuclear weapons. Under neither confirm nor deny it cannot know whether it has.

The Treaty of Rarotonga prohibits nuclear explosive devices, not nuclear propulsion. Article 5 obliges each party to prevent the stationing of any nuclear explosive device in its territory, and leaves visits by foreign ships to each party's discretion. Propulsion is therefore not the issue. Armament is.

No United States attack submarine has carried a nuclear weapon since 1992, so the distinction has not been tested. Congress has mandated a nuclear sea-launched cruise missile for the Virginia class, with limited deployment by September 2032 and initial operational capability by September 2034. Submarine Rotational Force-West begins at HMAS Stirling in 2027, with enduring access, a maintenance activity and a shore command.

Two outcomes are then possible. If the boats are unarmed while operating from Australia, the arrangement constrains the capability the base exists to support. If they are armed, Australia is not preventing what Article 5 requires it to prevent. Neither confirm nor deny makes the two indistinguishable from Canberra. The obligation remains; the means of verifying it does not exist.

The sequence is fixed and each step precedes the next decision point. Construction at Stirling is under way, rotations begin in 2027, and the weapon is due in 2032. No later date offers better information, because the arrangement that would supply it is the one that withholds it. The question is settled by policy before 2027 or it is not settled at all.

Read more: category DReferences[4] Nuclear-Armed Sea-Launched Cruise Missile (SLCM-N), IF12084 Congressional Research Service, United States[5] Sea Launched Cruise Nuclear Missile to Deliver in 2034, Says Admiral USNI News, 8 May 2025[77] Pacific Islands Forum chair reassured over the AUKUS nuclear submarine deal Asia Pacific Report, April 2023[78] South Pacific Nuclear Free Zone Treaty (Treaty of Rarotonga), full text Signed 6 August 1985, in force 11 December 1986[84] South Pacific Nuclear Free Zone Treaty and Protocols United States Department of State

Australia will be the first state without nuclear weapons to remove weapons-grade uranium from routine IAEA inspection.

Article 14 of Australia's Comprehensive Safeguards Agreement allows routine inspections to be suspended while nuclear material is inside a military activity the treaty does not prohibit. It has never been used by a non-nuclear-weapon state. Canada would have been the first in 1987 and abandoned its submarine plan.

The material is not ordinary reactor fuel. United States and United Kingdom naval reactors run on uranium enriched to about 93 per cent, which is weapons-grade, and each reactor holds roughly 200 kilograms of it. Low-enriched naval fuel exists — China and France use it — but American development of an equivalent is not expected to bear fruit until the 2040s, so the enrichment level is a consequence of the timetable rather than a choice.

The precedent is already being cited. Brazil opened its own Article 14 discussions with the Agency in May 2022. Iran notified the Agency in 2018 that it intended to build naval propulsion, is already enriching to 60 per cent, and its officials have invoked AUKUS at the United Nations in support of that programme. The Agency's own board has recorded that the arrangement sets a precedent for the safeguards system.

Read more: category OReferences[111] IAEA safeguards, the naval loophole and the AUKUS proposal Vienna Center for Disarmament and Non-Proliferation, October 2021[112] The international legal implications of AUKUS: a poor precedent for non-proliferation ANZSIL Perspective[113] Bad precedent: has AUKUS torpedoed the nuclear non-proliferation regime? The National Interest[114] AUKUS and the rules based international order Security and Defence PLuS Alliance

Submarine Rotational Force-West begins at HMAS Stirling in 2027, before any Australian boat exists.

Up to four United States Virginia-class submarines and one United Kingdom Astute will rotate through Western Australia. The arrangement is set out in the naval nuclear propulsion agreement tabled in Parliament in August 2024.

References[1] Agreement for Cooperation Related to Naval Nuclear Propulsion Australia, United Kingdom and United States; tabled in the Australian Parliament 12 August 2024

The United States is developing a nuclear cruise missile designed specifically for the Virginia class.

The Nuclear-Armed Sea-Launched Cruise Missile was proposed in the 2018 Nuclear Posture Review. The Biden administration proposed cancelling it in its 2022 review; Congress refused and directed the programme to proceed. Prototype design contracts and launcher work were awarded during 2025, and the Navy's milestone decision falls in financial year 2026.

References[4] Nuclear-Armed Sea-Launched Cruise Missile (SLCM-N), IF12084 Congressional Research Service, United States

Statute requires limited deployment by September 2032 and initial operational capability by September 2034.

Section 1640 of the FY2024 National Defense Authorization Act directed a programme to alter the W80-4 warhead and required initial operational capability no later than 30 September 2034. Section 1633 of the FY2026 Act requires a limited number of assets to enable limited operational deployment not later than September 2032.

References[4] Nuclear-Armed Sea-Launched Cruise Missile (SLCM-N), IF12084 Congressional Research Service, United States

The director of Strategic Systems Programs lists it among his three top warfighting priorities.

Vice Admiral Johnny Wolfe told a House Armed Services subcommittee in May 2025 that the programme had completed an industry day and was defining the system architecture, and that executing it requires careful balancing of resources against the attack submarine force.

References[5] Sea Launched Cruise Nuclear Missile to Deliver in 2034, Says Admiral USNI News, 8 May 2025

No United States attack submarine has carried a nuclear weapon since 1992. The missile does not yet exist.

President George H. W. Bush withdrew sea-based tactical nuclear weapons in 1991; the nuclear Tomahawk left the boats by 1992 and was retired outright in 2013. The SLCM-N remains in development: no warhead built, no missile built. Any claim that nuclear weapons are already at Australian ports is untrue, and this register does not make it.

References[4] Nuclear-Armed Sea-Launched Cruise Missile (SLCM-N), IF12084 Congressional Research Service, United States

Rotations begin 2027. The weapon is mandated for 2032 and 2034. Australia's own boats arrive in the 2030s.

Within the working life of the base at Cockburn Sound, the submarines alongside it may be capable of carrying nuclear weapons.

Longstanding United States policy is to neither confirm nor deny the presence of nuclear weapons aboard any vessel.

The policy applies in Australian ports. No Australian government will be able to state whether a particular submarine is carrying a nuclear weapon, because the practice forbids the answer.

Virginia-class submarines were not built to carry nuclear weapons; custody, handling, training and planning must change.

Introducing the role requires new procedures for weapons custody and handling, crew training and mission planning, and Navy officials have said the nuclear mission must be balanced against the conventional role the fleet exists for.

References[5] Sea Launched Cruise Nuclear Missile to Deliver in 2034, Says Admiral USNI News, 8 May 2025

No Australian government has sought public consent to host submarines that may carry nuclear weapons.

The question has not been put at an election, in a referendum, or through a parliamentary inquiry.

Pine Gap, HMAS Stirling, North West Cape and Tindal are the sites the arrangement deepens.

Senior former officials, including a former Defence Department secretary, have warned publicly that the arrangement raises the risk of Australia being attacked.

The same agency is delivering the LRSO and the next ballistic missile warhead. SLCM-N is added on top.

A non-nuclear-weapon state taking naval fuel out of safeguards is a precedent every other state can cite.

Read more: category C

In August 2026 the United States ordered a finished carrier design changed by memorandum. Australia's boats share that system.

A National Security Presidential Memorandum signed in August 2026 directs the Navy to replace the Electromagnetic Aircraft Launch System and Advanced Weapons Elevators with steam catapults and hydraulic systems from CVN-81 onward, with a plan due within sixty days. The Ford class was designed around electrification from the outset; steam requires high-pressure piping, accumulators and machinery spaces that were engineered out of the design.

References[6] Trump orders return of steam catapults on carriers, fifth public shipyard Breaking Defense, August 2026[7] Full steam in reverse: Trump orders US Navy back to old-style aircraft catapults Navy Lookout, August 2026

The carrier being redesigned is built at Newport News — the yard that also builds Virginia-class submarines.

CVN-81, the future USS Doris Miller, is under construction at HII Newport News Shipbuilding. Newport News is one of the two yards building the Virginia class. Engineering, trades and management capacity redirected to an unplanned carrier redesign is capacity not available to submarine production.

References[6] Trump orders return of steam catapults on carriers, fifth public shipyard Breaking Defense, August 2026

The catapult manufacturer states production is nearly half complete and reversal brings significant cost, schedule and integration risk.

General Atomics, the EMALS contractor, said publicly that with nearly 50 per cent of production complete, changing course would introduce significant cost, schedule and integration risks. Reporting indicates the change could add billions and push the ship's deployment into the late 2030s.

References[8] Trump's directive to revert to steam catapults on new aircraft carrier baffles naval experts CNN, 14 August 2026

The United States Navy has not bought a steam catapult in more than twenty years.

Suppliers are unlikely to be able to build them without substantial up-front investment and time to establish production lines — the same constraint, in the same industrial base, that governs submarine output.

References[6] Trump orders return of steam catapults on carriers, fifth public shipyard Breaking Defense, August 2026

The same memorandum orders a fifth public shipyard, a submarine component repair centre and a NAVSEA reorganisation.

The memorandum directs the establishment of a fifth public shipyard to increase nuclear submarine and carrier readiness, a Component Repair Centre holding at least one ship set of spares for the Los Angeles, Virginia, Seawolf, Ohio and Columbia classes, and a review and reorganisation of Naval Sea Systems Command. Australia's transfer depends on the output of the system being reorganised.

References[9] Trump orders Navy to ditch EMALS for steam catapults on aircraft carriers The Hill, August 2026

The second Ford-class carrier's delivery moved to 2027, nearly three years later than planned.

The record of the yard Australia depends on is one of schedule growth before any of these changes were ordered.

References[7] Full steam in reverse: Trump orders US Navy back to old-style aircraft catapults Navy Lookout, August 2026

Nothing in the arrangement requires Australia to be consulted before a partner changes a programme Australia funds.

An American carrier and significant personnel and armaments have been moved from the Indo-Pacific to the Middle East.

Allied presence in the theatre the plan is built around is not a fixed quantity. It is allocated by another government according to its own priorities, and in 2026 those priorities moved elsewhere.

References[12] Australia appears confused about its place in the global world order Laura Tingle, ABC News, 5 September 2026

Two yards can build nuclear vessels and one reactor supplier serves them all. A new battleship class has been added to the queue.

The United States has two shipyards able to build nuclear-powered vessels, General Dynamics Electric Boat and Newport News. Only Newport News can build nuclear-powered surface ships. Both are already committed to Columbia-class ballistic missile submarines, which are the Navy's top acquisition priority, and to the Virginia class Australia is buying from.

In December 2025 a new class of nuclear-powered battleships was announced, fifteen ships by 2055 with the first due in 2036. The Congressional Budget Office estimates the first at about ten billion dollars more than a Ford-class carrier, and the programme at up to $275 billion. Assembly would fall to Newport News, which would need Dock 12, currently committed for several years to three Ford-class carriers that are themselves behind schedule.

Congress has objected on capacity grounds. The House Armed Services Committee recorded that carrier delays driven by supply chain and workforce problems, coupled with a lack of physical shipbuilding capacity, could be worsened by a new nuclear surface programme and could jeopardise Ford-class delivery. It has blocked construction until the weapon systems are shown to be mature; the design includes rail guns that are not fully developed.

One supplier, BWXT, provides the reactors for all of it — carriers, Virginia boats, Columbia boats, and now battleships.

Read more: category FReferences[89] Legislators demand Navy prove Trump-class battleships won't sink US nuclear shipbuilding The War Zone, June 2026[90] Trump-class battleships could come with a $275 billion price tag CNN, August 2026, reporting the Congressional Budget Office[91] Analysts predict Newport News lacks room to build Trump's battleships VPM, August 2026, reporting the Congressional Budget Office

A United States President must certify that transferring a submarine will not degrade American capability.

No Australian decision can produce the boat. The condition applies to each hull.

Requirement 66, fleet 49. Building 1.2 a year, needing 2.33. Retiring two or three. Australia's boats come out of that.

The United States Navy's force-level goal is 66 attack submarines. It began the 2026 financial year with 49.

Production does not close the gap. The Congressional Research Service records Virginia-class construction since 2022 at about 1.1 to 1.2 boats a year, against the 2.33 a year the Navy states is needed to sustain two-a-year procurement, replace the three to five boats to be sold to Australia, and work off the backlog. The Government Accountability Office recorded 1.15 boats in 2024 against a Navy goal of 1.5. Procurement ran at two a year from 2011 to 2024 and dropped to one in 2025. The recovery plan reaches 2.0 boats a year by 2028 and 2.33 in the early 2030s, the year the first transfer is due.

Retirement is the other half of the sum, and it has begun. Sixty-two Los Angeles-class boats were built between 1976 and 1996; 42 had retired by the start of 2026. The driver is reactor life rather than policy, the cores having been designed for 35 to 40 years. Three more left in 2026 and a fourth, USS Boise, was retired early after its overhaul was cancelled at 25 per cent complete and $800 million spent.

Netted out, when two or three boats retire in a year and one enters service, the force loses one to two submarines annually despite continuous construction. It is projected to bottom at 46 to 47 boats around 2030 and to reach 66 in the mid-2050s.

Two dates finish it. The Navy's own projection of that trough does not account for selling three to five boats to Australia. And the mid-2050s, when the American fleet is forecast to reach its requirement, is when Australia's eight boats are also due.

Read more: category QReferences[85] Navy Virginia-Class Submarine Program and AUKUS Submarine (Pillar 1) Project: Background and Issues for Congress, RL32418 Congressional Research Service[86] The Navy built 62 Los Angeles-class submarines. It cannot replace them fast enough 19FortyFive, July 2026[87] US Navy submarine crisis worsens as USS San Juan retires Army Recognition, August 2026[88] The US Navy is retiring nuclear attack submarines faster than it can build them 19FortyFive, March 2026, citing the United States Naval Institute[130] US attack submarine output still short of Navy goal UK Defence Journal, September 2026

The reactors run on highly enriched uranium Australia cannot produce, service or reprocess.

Read more: category L

The plant arrives as a sealed unit. Australia is not equipped to open it.

American and British law governs what Australia may do with the equipment it owns.

"Integrated deterrence" and "pooled sovereignty" describe shared control, not sovereign control.

Rotational American and British submarines and personnel are based at Garden Island from 2027, years before any Australian hull.

Submarine Rotational Force-West begins at HMAS Stirling from 2027 with up to four United States Virginia-class submarines and one United Kingdom Astute. United States Submarine Squadron 3 has been re-established to oversee American boats operating from there, a Lead Maintenance Activity begins in Western Australia from mid-2026, and Naval Support Activity Stirling has been established to deliver services for American personnel, contractors and their families. The base expansion is put at about $8 billion with roughly 2,300 United States personnel.

The Australian Submarine Agency states that the American elements of SRF-West are implemented under the 2014 Force Posture Agreement, and that Australia maintains a longstanding bipartisan policy of no foreign bases on Australian soil. In August 2026 the Chief of the Defence Force confirmed American attack submarines will retain enduring access, replacing earlier statements suggesting a five-year limit.

References[1] Agreement for Cooperation Related to Naval Nuclear Propulsion Australia, United Kingdom and United States; tabled in the Australian Parliament 12 August 2024[22] Submarine Rotational Force West Australian Submarine Agency, Commonwealth of Australia[23] AUKUS partners take next steps towards Submarine Rotational Force West Minister for Defence, 12 June 2026[24] HMAS Stirling and Submarine Rotational Force West Nautilus Institute for Security and Sustainability

Facilities used in a war make Australia a participant regardless of any decision to stay out.

Read more: category D

No public document sets out how Australia would decline to participate in an allied operation.

References[58] Securing Australia's sovereignty Minister for Defence, February 2023[59] AUKUS and US forces: the question of independence ASPI The Strategist, September 2024[60] From Pine Gap to HMAS Stirling: Australia must reclaim strategic authorship Defence Connect, March 2026

Spares, expertise and certification come from two other countries for the life of the fleet.

Australia's naval nuclear regulator was established in November 2025 and has never regulated a submarine.

The Australian Naval Nuclear Power Safety Regulator was established as an independent statutory agency on 1 November 2025 under the Australian Naval Nuclear Power Safety Act 2024. Its framework draws on United States and United Kingdom practice. Regulations covering submarine-specific activities — the acquisition and operation of the boats themselves — are still to be developed.

References[10] Australian Naval Nuclear Power Safety Regulator Commonwealth of Australia[11] An AUKUS milestone: launch of the Australian Naval Nuclear Power Safety Regulator Minister for Defence, 1 November 2025

Asked why Washington would hand over a submarine, the Defence Minister answered that the arrangement benefits the United States Navy.

In Washington in September 2026 the Deputy Prime Minister was asked why any American president would give away a submarine the United States cannot build fast enough for itself. His answer was that the arrangement generates additional operational days for the Virginia-class fleet — his phrase was “sea days for the United States Navy” — and that Submarine Rotational Force-West and the Henderson precinct let American boats be maintained closer to their area of operation. That is the government’s own account of why the agreement is valuable to the seller.

References[12] Australia appears confused about its place in the global world order Laura Tingle, ABC News, 5 September 2026

What was announced as a transfer of capability is being described as an expanded American presence in Australia.

The same visit announced a further escalation of the United States military presence in Australia. The submarine presence in Western Australia sits alongside the annual rotation of American marines through Darwin and the American presence at the Tindal air base. The capability Australia was to acquire has not arrived; the presence has.

References[12] Australia appears confused about its place in the global world order Laura Tingle, ABC News, 5 September 2026

The treaty governing the American presence runs 25 years, then continues by default. Nobody has to decide again.

Article XXI of the Force Posture Agreement provides that it remains in force for 25 years and thereafter continues in force, terminable at any time on one year's written notice. It entered into force on 31 March 2015, so the stated term expires in 2040. Australia's first transferred submarine is due in the 2030s and the sovereign build in the 2040s and 2050s. The instrument that authorises the presence therefore reaches the end of its term before the capability it supports is delivered, and then rolls on unless a government acts to end it.

Neither ANZUS nor the AUKUS arrangements authorise the American presence in Australia. The Force Posture Agreement does, and it was signed in 2014, seven years before AUKUS was announced.

References[19] Force Posture Agreement between Australia and the United States of America, [2015] ATS 1 Australian Treaties Database, Department of Foreign Affairs and Trade[21] Force Posture Agreement, National Interest Analysis [2014] ATNIA 19 Australian Treaty documents, via AustLII

Rotations at Stirling are American and British submarines under their own command. Presence is not the same as capability.

The arrangement between the retirement of the Collins boats and the arrival of Australian ones is Submarine Rotational Force-West, from 2027: up to four United States Virginias and one British Astute operating from HMAS Stirling. HMS Anson has already visited and departed.

Those boats are not Australian capability. They are commanded, crewed and tasked by their own governments, and nothing published gives Australia authority to direct them or an assurance that a rotation will be present in a given month. If a boat is required elsewhere, Australia has neither the submarine nor a say in its absence.

The fleets they come from are not in a position to be generous. The Royal Navy has nine submarines in service, of which one Astute is at high readiness and four are assessed at low or very low; British attack submarine availability reached zero in 2026. The United States is seventeen boats short of its own requirement.

The stated purpose points the other way. Asked why an American president would transfer a submarine, the Deputy Prime Minister answered that the arrangement generates sea days for the United States Navy, and that Stirling and Henderson allow American boats to be maintained closer to their area of operation.

Read more: category QReferences[98] UK submarine fleet House of Commons Library[99] The Royal Navy has only one combat-ready Astute-class nuclear attack submarine 19FortyFive, March 2026[22] Submarine Rotational Force West Australian Submarine Agency, Commonwealth of Australia[23] AUKUS partners take next steps towards Submarine Rotational Force West Minister for Defence, 12 June 2026

The 2023 plan was two used boats and one new. In May 2026 the new boat was taken out and a third used one put in its place.

Under the Optimal Pathway announced in March 2023, Australia was to receive two in-service Block IV Virginias in 2032 and 2035, and a newly built boat in 2038, reported as Block VII. On 30 May 2026, at the Shangri-La Dialogue, the arrangement was revised: all three are now in-service Block IV hulls, delivered in 2032, 2035 and 2038. The option to buy two new boats in 2041 and 2044 if required was retained.

The boats are to be drawn from the cohort commissioned between 2020 and 2028. A Virginia is designed for 33 years, so a hull transferred in 2038 arrives with between six and fifteen years already spent, and a naval analyst notes the third boat will be an older version than planned with less capable sensors.

The stated reason is simplification, and it is a real one: operating a single class avoids running four submarine types at once. The consequence is that the programme's risk moves from American production capacity, which is short, onto the remaining life of the particular hulls eventually chosen, which has not been published.

References[122] AUKUS revised timeline comparison United States Studies Centre, June 2026[123] Why Australia dropped new Virginia-class submarines for three used US Navy units Army Recognition, June 2026[124] Why is Australia buying used submarines? A naval expert answers key AUKUS questions The Conversation, July 2026[125] Here is when the US Navy plans to sell subs to Australia under AUKUS Defense News

Thirty-three years of design life, six to fifteen of them gone on arrival, and no way to refuel the reactor.

A Virginia is designed for about 33 years and its reactor core lasts the life of the hull. It cannot be refuelled. When the core is exhausted the boat retires, whatever condition the rest of it is in.

The three boats Australia is to receive were commissioned between 2020 and 2028 and arrive in 2032, 2035 and 2038. On the American estimate they will have between six and fifteen years of use behind them when they change flag. The last of them therefore has something in the order of eighteen to twenty-five years left, and must serve until the Australian-built boats arrive, the first in the early 2040s and the rest through the 2050s.

Calendar age is also the wrong measure. Core life is counted in effective full power hours, so a boat that has been worked hard has less remaining than one of the same age that has not. Which hulls Australia receives, and how hard each has been run, has not been published.

Read more: The Island Castle §18References[125] Here is when the US Navy plans to sell subs to Australia under AUKUS Defense News[122] AUKUS revised timeline comparison United States Studies Centre, June 2026[124] Why is Australia buying used submarines? A naval expert answers key AUKUS questions The Conversation, July 2026

Australia will run two different submarine types with two reactors and two supply chains.

Virginias first, SSN-AUKUS later. Two reactor designs, two sets of spares, two training pipelines, two safety cases and two regulators to satisfy — for a fleet of eight.

The joint design is larger than both the Astute and the Virginia it draws from.

References[37] Nuclear versus diesel-electric: the case for conventional submarines for the RAN Hans Ohff, former managing director of ASC, in ASPI The Strategist[38] Ask an expert: why are submarines so important? University of New South Wales

Australia's northern approaches are shallow and confined. The boat is built for open ocean.

The Torres and Timor seas and the archipelagic waters north of Australia are the water an adversary would come through. They favour mines, uncrewed systems and smaller boats.

Read more: The Island CastleReferences[37] Nuclear versus diesel-electric: the case for conventional submarines for the RAN Hans Ohff, former managing director of ASC, in ASPI The Strategist[38] Ask an expert: why are submarines so important? University of New South Wales[39] The deterrence advantage of nuclear-powered submarines in a contested Indo-Pacific Parliamentary Library, Parliament of Australia

Full strength is reached three decades after the threat that justified it was declared urgent.

The later boats are a first-of-class design that does not yet exist anywhere.

Read more: category J

Britain builds the first ones. Australia inherits whatever the first-of-class programme discovers.

A nuclear submarine needs a larger, differently trained crew than Australia has ever manned.

Read more: category P

The boats carry American systems and weapons under American export control.

Read more: category F

Two or three boats at sea, twelve missiles apiece on the earlier blocks, and a return to port to reload.

The submarines carry three things that matter: torpedoes, cruise missiles and the ability to watch without being seen. The third is real and is not in question here. The second is what the strike case rests on, and it can be counted.

Block IV carries twelve vertically launched Tomahawks, through two payload tubes of six, with about twenty-five weapons in the torpedo room. The stretched Block V and VI, with the Virginia Payload Module, carry forty. Australia is receiving Block IV. The revision of May 2026 removed the one new-build boat from the plan, and with it the possibility of the larger magazine. Tomahawk reaches about fifteen hundred kilometres.

Set that against the availability arithmetic. Two or three Australian boats at sea is between twenty-four and thirty-six cruise missiles in the water at any time. A submarine that empties its tubes cannot reload at sea; it must reach a port or a tender, and from the South China Sea that is a transit of thousands of kilometres each way.

No published document states what target set those missiles are meant to hold at risk, or how many salvoes the strategy assumes.

Read more: category GReferences[119] Virginia class SSN Submarine Industrial Base Council[120] Stretched Virginia class recategorised as guided missile submarines The War Zone, August 2026[121] USS Virginia returns after a 36,000-mile European deployment Army Recognition, August 2026, citing the Congressional Research Service[122] AUKUS revised timeline comparison United States Studies Centre, June 2026

Britain has 23 retired nuclear submarines in storage, 12 still fuelled, and has not completed the disposal of a single boat in 43 years.

The United Kingdom stopped sinking retired reactors at sea when the London Dumping Convention prohibited it in 1983, and has been storing the boats afloat ever since. The latest Defence Nuclear Enterprise inventory records 16 at Devonport and seven at Rosyth. There are more decommissioned submarines in storage than there are in the operational flotilla.

Twelve of them still hold irradiated reactor fuel. Defuelling stopped in 2004 when the regulator judged the Devonport facilities short of modern standards. Restart was expected in 2012, then 2023, and is now 2026. A parliamentary answer in December 2025 gave no completion dates for the twelve.

HMS Swiftsure was decommissioned in 1992 and is the pilot for the dismantling process, which began at Rosyth in 2016, about fifteen years late. It is not finished. The National Audit Office found the whole-life cost had risen by £0.8 billion, or 50 per cent, and the Ministry of Defence has spent more than £500 million simply holding the boats in place.

Disposal of the eventual total is put at £10.4 billion over 25 years. Final disposal of the intermediate-level waste depends on a geological facility not expected to accept it until the 2050s.

Read more: category NReferences[126] The Royal Navy has taken 43 years to dispose of one nuclear submarine and 22 more need to be broken up 19FortyFive, August 2026[127] Project to dismantle ex-Royal Navy nuclear submarines inches forward Navy Lookout, January 2026[128] HMS Swiftsure drydocked in Rosyth for recycling Naval Technology, citing the National Audit Office[129] The painfully slow process of dismantling ex-Royal Navy nuclear submarines Navy Lookout

The threat is described as immediate. The first transferred submarine is due in the 2030s.

The sovereign capability the programme exists to create arrives twenty years after the announcement.

Without extension the Collins boats retire from 2026. The programme bridging to AUKUS began before its design was complete.

The Collins class has a design life of 28 years. Without extension the six boats were to be withdrawn between 2026 and 2036, and on that path Australia reaches two boats when the first Virginia arrives and none by the second. The life-of-type extension exists to prevent that. It began at the end of May 2026 with HMAS Farncomb, at up to $11 billion over ten years, and is intended to add about ten years to each boat, carrying the last into the late 2040s.

The Australian National Audit Office has examined it. One of five key design reviews was achieved on schedule. Accumulated delays contributed to a decision to reduce the scope planned for Farncomb, and design work for the full core work package was not complete as at early 2026 — the year the work started. No separate performance management framework was established for the extension, and no project-specific performance measures were written into either the support contract or the design contract.

The boats themselves are not a known quantity. Defence disclosed severe corrosion in Farncomb and separate structural defects in Sheean, and because the class was built under varying conditions each hull presents differently. The full extent of the work becomes clear only after each boat is opened up.

Read more: category KReferences[95] Defence's Collins Class Submarines Life of Type Extension: Planning and Implementation Australian National Audit Office[96] Australian Government launches A$11 billion Collins-class submarine extension programme The Defense News, May 2026[97] What role should the Collins Life of Type Extension play in Australia's submarine transition? Strategic Analysis Australia, August 2024

Elements of the pathway have shifted since the 2023 announcement, including the class of boat transferred.

Yards, wharves, waste facilities and training establishments must exist before a submarine can be based here.

Late equipment delays the yard, which delays the crew pipeline, which delays the boat.

Defence assessed motors, engines and generators as the medium-to-high risk to reaching the extended life. In May 2026 it cancelled their replacement.

The core work package of the extension was the machinery: main motors, diesel engines, electrical generators, power conversion and distribution, and the cooling system. Defence's stated reason for replacing them was that those items presented a medium-to-high risk of the boats not meeting their planned withdrawal dates. An optronics mast was also in scope, and was removed in mid-2024 after $33 million had been spent on it.

In March 2026 Defence proposed refurbishing and maintaining the existing systems instead of replacing them, for up to five of the six boats. The Auditor-General records that this represented a fundamental shift in the delivery strategy. Government agreed in May, announcing a conditions-based approach in which each boat is assessed individually and base components are retained and restored. Most or all of the boats will now run their original engines until retirement in the 2040s.

Long-lead items had already been bought. Approved funding of $1.8 billion included the procurement of new diesel motors and generators for Farncomb and Collins.

The hull is not the concern. That assessment was done, was favourable, and was peer-reviewed by the United States Navy's NAVSEA and by Saab-Kockums. What is being asked to last another decade is the machinery inside it, which Defence itself identified as the thing most likely to fail first.

Read more: category KReferences[100] Planned upgrades to Collins Class submarines scaled back ABC News, 19 May 2026[101] Submarines sail troubled waters Australian Defence Magazine, May 2026, reporting the Australian National Audit Office[102] An update on the Collins class life extension program Defense.info, November 2021[103] First Collins LOTE may be descoped Australian Defence Magazine

$368 billion is an estimate across three decades, not a contract price. No ceiling has been set.

The figure covers acquisition and sustainment to the 2050s. It is a planning estimate, not a fixed-price commitment, and no cap on the Commonwealth's exposure has been legislated or published.

Read more: The AUKUS Cost Blowout

No published assessment costs what the posture does to trade, education, research or investment.

The $368 billion covers hulls, yards and sustainment. It does not cover the relationship with Australia's largest trading partner. No Treasury or Productivity Commission analysis of that exposure has been published.

Read more: The AUKUS Cost Blowout

Payments to United States and United Kingdom industry began years before any submarine arrives.

Australia has committed direct payments into the American and British submarine industrial bases as a condition of the pathway. Those payments are made whether or not a boat is ever transferred.

Australian money expands production capacity in Connecticut, Virginia, Barrow and Derby.

The pathway requires Australia to contribute to lifting United States build and sustainment rates and to the United Kingdom's submarine industrial base. The assets built with that money are not Australian.

Comparable programmes ran far above their announced cost. Nothing in this one is priced against that record.

The preceding French programme rose substantially before a hull was laid, and the British Astute class ran significantly over its first-of-class estimate. No published Australian estimate applies a contingency drawn from those cases.

Read more: The AUKUS Cost Blowout

Most of the money is not the submarines. It is keeping them running for forty years.

Acquisition is a minority of the lifetime figure. Sustainment, infrastructure, training and disposal make up the balance, over decades, at costs Australia has never carried for a nuclear fleet.

Shipyards, bases, waste facilities and training establishments are counted separately or not at all.

Announcements for Osborne and Henderson are made and funded outside the submarine figure, so the headline understates the total commitment.

No published provision exists for dismantling the boats or storing the reactor cores.

Each hull ends its life as high-level radioactive waste requiring long-term management. No costed disposal programme has been published.

Read more: category O

No published comparison shows what the same money would buy in fuel, refining, munitions or transmission.

Read more: The Prize · The Sovereign Manufacturing Multiplier

No published threshold requires the programme to be re-examined if the estimate rises.

The claimed industrial and economic returns have not been published as a costed forecast.