Australia’s vast maritime approaches make stealth and endurance more than technical advantages: they are central to whether submarines can survive and operate in a crisis. Conventional diesel submarines must periodically surface or expose a breathing mast to run engines and recharge batteries. On long transits across Australian waters, those “snorts” create moments when patterns of movement, emerging detection technologies and surveillance from drones and satellites can make them easier to find.
This Explainer argues that the challenge is not simply to acquire nuclear-powered submarines, but to build the wider undersea power Australia needs: the people, technology, infrastructure, industry and knowledge to understand and protect its maritime domain. It sets out why AUKUS should be judged not only by cost and delivery dates, but by the capabilities Australia develops before its own submarines arrive—and whether those capabilities strengthen the country’s ability to shape its strategic future.
