Memo 21 · ROI · Defence · Oil
Without the SBC
The counterfactual.
Read →Reposition AUKUS for defensive sovereignty. Mass-produced unmanned coastal defence. Sovereign Defence Manufacturing under the SBC umbrella. Defence through nation building.
Cons: the existing AUKUS programme as currently structured and the strategic posture it locks Australia into. Pros: the MMA position — reposition AUKUS into a defensive sovereignty programme delivering durable national capability, not eight crewed submarines arriving in the 2040s. The detailed financial case — capex, returns, and what Australia spends without SBC — sits in the Defence memo and the programme-wide ROI summary.
Eight nuclear submarines arriving from the 2040s are sold as protecting Australian shipping lanes. Recent events in the Red Sea and the Strait of Hormuz demonstrate that even combined US, UK, EU and coalition forces cannot reliably keep those lanes open. Eight Australian SSNs cannot do what the world’s most powerful navies cannot.
Australia has 35,000 km of coastline and 8 million km2 of Exclusive Economic Zone. No achievable Australian navy can be everywhere at once. Traditional forward defence at continental scale is prohibitively expensive or strategically incoherent.
Australia imports approximately 90% of its refined fuel, on foreign-owned and foreign-crewed vessels, through chokepoints thousands of kilometres from Australian bases. Eight submarines cannot escort 60+ tanker movements per month. The arithmetic does not allow it.
The current AUKUS structure depends on foreign supply chains for nuclear propulsion, specialised steel, advanced electronics, and the maintenance ecosystem over a 50-year service life. Sovereign capability that depends on foreign suppliers for its critical components is not sovereign capability.
Around two-thirds of Australia’s two-way trade is with the Asian community of nations. A defence policy that treats those relationships as adversarial materially impoverishes the country it claims to defend. Strategic bifurcation makes major-power war more likely, not less.
Australia is the only IEA member country that has not met the 90-day strategic fuel reserve requirement since 2012. Current working reserves run at approximately 30–40 days, exposing the country to acute disruption from precisely the chokepoint events that already happen.
Retain the workforce, the funding commitments, the shipyards, the security partnerships. Redirect the output: from eight crewed submarines to several hundred unmanned coastal defence platforms, plus a fleet of cable-laying and pipeline vessels, plus Sovereign Defence Manufacturing. Same alliance, stronger contribution.
A coastline patrolled by hundreds of persistent unmanned platforms is a much harder target than one patrolled by eight crewed submarines. The Ghost Shark line, scaled dramatically upward; the AUKUS Pillar 2 autonomous-systems work, made central rather than supplementary.
An industrial programme dimensioned around combined demand from SBC civilian infrastructure and the repositioned defence base. Cables, pipes, composites, electronics, naval architecture components, ammunition, pharmaceuticals. SBC and defence demand together justify the manufacturing base neither could justify alone.
Electrified freight on the SBC corridor progressively moves national tonne-kilometres off imported diesel. Maglev removes domestic jet-fuel demand. Agrivoltaic supplies the agricultural energy base. The shipping-lane dependency is not defended — it is retired. 90-day reserve held as a transition bridge.
Active diplomatic posture across the region, with the infrastructure connectors that bind Australia to its neighbours on the European-Union model of integration deep enough that conflict becomes structurally unattractive. Strategic neutrality from a position of internal strength.
The same total quantum already in the MMA platform — approximately $90 billion per year — but allocated to capability that lasts and compounds: unmanned mass production, sovereign manufacturing, fuel reserves, regional connectors, the 3-sphere drone capability. Defence spending that builds the country it defends.
Programme-wide ROI summary → · Memo 19 (cost) · Memo 20 (returns) · Memo 21 (counterfactual)