Australia’s Aukus submarine choice faces scrutiny over defensive needs

Australia’s plan to acquire three secondhand Virginia-class submarines from 2032 drew criticism from defence specialists who questioned their suitability for regional defence, the Guardian reported in October 2026. Former Defence Department analyst Andrew Gaczol argued that smaller conventional submarines with air-independent propulsion would better suit shallow northern waters. Former submariner Rex Patrick said a larger conventional fleet could provide broader coverage at lower cost.

The government defended Aukus as its preferred option. Defence minister Richard Marles emphasised Australia’s reliance on maritime trade and imported fuel, while other supporters argued nuclear submarines offered superior speed, endurance and deterrence. The reported plan envisaged three Virginia-class boats followed by up to five Aukus-class submarines.

The debate concerns fleet availability as well as submarine performance. The report explained that maintenance and training typically leave only about one vessel in three available for deployment. On that basis, the planned eight-boat fleet could put two or three submarines on active duty at a time, a limitation critics highlighted when questioning trade-route protection.