Australia has amended its AUKUS defense agreement, abandoning plans to acquire a new Virginia-class nuclear-powered submarine in favor of purchasing three second-hand vessels from the United States. Defence Minister Richard Marles announced the shift on Sunday at the IISS Shangri-La Dialogue in Singapore, framing the decision as a necessary step to streamline an increasingly complex naval program.
Under the original 2021 agreement, Australia was slated to receive a mix of two used and one new Virginia-class submarine. The revised plan, announced late Saturday by the United States, the United Kingdom, and Australia, confirms that Australia will no longer acquire any new-build submarines, instead securing three vessels from the same production block.
Minister Marles defended the logistical pivot by noting that the previous acquisition path threatened to force the Australian Navy to manage four distinct classes of submarines simultaneously. "We had the prospect of almost having four classes of submarines operating at the same time—the last of the Collins Class, two in-service Virginias, a brand new Virginia, and a brand new SSN-AUKUS," Marles told reporters. "What we will have here is a simpler pathway. The Virginias we are acquiring will all be of the same type and I can't overstate the significance of that."
While the government claims the move will create "significant" savings, Marles conceded that the change does not fundamentally alter the total cost of the broader, multi-billion-dollar program. "It doesn't fundamentally change the equation, but it will help," he said, despite previously branding the move as "cost-effective" during his briefing.
The shift has already drawn scrutiny from the Australian opposition. Shadow Defence Minister James Paterson stated that the policy change warrants a more detailed justification than the brief joint statement released by the partner nations. Paterson confirmed he will seek a formal explanation regarding the strategic implications of the decision during Senate estimates hearings scheduled for this week.
The decision to move to an all-used fleet is intended to address the logistical burden of maintaining a diverse submarine force. By ensuring all three Virginia-class boats are from the same production block, the Australian government aims to simplify supply-chain requirements and operational training. The move marks a definitive departure from the original AUKUS roadmap, which had envisioned a mix of legacy and new-build platforms to bridge the gap before the introduction of the future SSN-AUKUS class.
