Australia to Receive Used Nuclear-Powered Submarines Under Updated AUKUS Agreement
Australia will exclusively receive used nuclear-powered submarines from the United States as part of a revised agreement under the AUKUS security pact, a decision highlighted by Defence Minister Richard Marles as a “cost-effective” measure. The adjustment was unveiled during the recent Shangri-La Dialogue in Singapore, which gathers top defense officials and experts from approximately 45 nations.
Background of the AUKUS Agreement
Originally established in 2021, the AUKUS deal between Australia, the United States, and the United Kingdom aimed to bolster Australia’s naval capabilities by acquiring nuclear-powered submarines. Under the initial terms, Australia was expected to receive two second-hand submarines and one new vessel from the U.S. Navy. However, recent announcements confirmed that all three units will now be in-service submarines from the American fleet.
Marles, who also serves as the Deputy Prime Minister, emphasized the need for simplicity in operational procedures. “In the context of a very complicated endeavor, we need to place a premium on simplicity,” he remarked, noting that the submarines will all feature the same specifications, facilitating easier training and maintenance for Australian crews.
Strategic Implications
In a joint statement with U.S. Defense Secretary Pete Hegseth and U.K. Secretary for Defense John Healey, Marles outlined the strategic advantages of this streamlined approach. The agreement will simplify supply chain management and operational and maintenance requirements, maximizing cost efficiencies for the Australian military. This change is particularly significant given the ongoing challenges faced by U.S. shipyards that have struggled to meet production targets, producing only two new Virginia-class submarines annually.
The U.S. Navy currently operates 24 Virginia-class vessels, but there has been growing criticism within the U.S. regarding the decision to sell nuclear-powered submarines to Australia before adequately equipping its own military. Questions have emerged over why Washington would prioritize these sales amid its own military needs.
Financial Considerations
The AUKUS submarine program is projected to significantly impact Australia’s defense budget, with forecasts estimating costs could reach up to USD 235 billion over the next three decades. Marles acknowledged the financial burden, stating, “It is definitely cost-effective. And to be clear, this is a very expensive program… and so we are trying to find every cost-effective option as we walk down this path.”
This transition to acquiring used submarines is expected to expedite Australia’s naval capabilities while addressing budgetary constraints. The acknowledgment of potential cost savings serves to align with both the geopolitical ambitions of the AUKUS partnership and the practical realities of sustaining a robust defense strategy.
Future Outlook
As the AUKUS partnership continues to evolve, Australia’s strategic enhancements underscore its commitment to regional security and defense collaboration with its allies. The revised agreement on the submarine acquisitions signifies a crucial step in Australia’s efforts to modernize its military capabilities while navigating complex logistical and financial landscapes.
Overall, the decision to opt for used submarines signifies both a strategic and economic move as Australia seeks to strengthen its defensive posture in an increasingly complex global environment. With the AUKUS alliance at the forefront of these developments, the focus remains on enhancing interoperability and readiness among the allied forces.

