The arrival of HMS Anson, a British nuclear-powered attack submarine, at HMAS Stirling in Western Australia marks a significant step forward in the AUKUS security pact, signaling a new era of collaboration between Australia, the United Kingdom and the United States. What we have is the first time a UK nuclear-powered submarine has undergone maintenance in Australia, a milestone demonstrating the deepening commitment to the trilateral agreement and Australia’s preparations to acquire its own nuclear-powered submarine capability. The Australian Department of Defence confirmed the arrival on February 22, 2026.
The visit, which began this morning, will see approximately 100 personnel from the Royal Navy, the UK Submarine Delivery Agency, the Royal Australian Navy, ASC Pty Ltd, and Pearl Harbor Naval Shipyard working together on maintenance and familiarization activities aboard the Astute-class submarine. This collaborative effort is not merely about maintaining HMS Anson; it’s about building the expertise and infrastructure necessary for Australia to operate and sustain its future fleet of nuclear-powered submarines. The AUKUS agreement, announced in 2021, aims to provide Australia with conventionally-armed, nuclear-powered submarines, a capability seen as crucial for navigating the evolving geopolitical landscape in the Indo-Pacific region.
Building Australian Expertise Through Collaboration
The UK Submarine Maintenance Period (UK SMP) builds upon previous work undertaken with US Virginia-class submarines, USS Vermont in 2025 and USS Hawaii in 2024, further strengthening the skills, systems, and supply chains required for routine maintenance of these complex vessels. According to the Australian Broadcasting Corporation, the 97-metre-long HMS Anson carries a crew of around 100 and is equipped with both torpedoes and land-attack missiles.
Two Royal Australian Navy officers are currently embedded aboard HMS Anson, gaining invaluable operational experience. More than 50 Australians are also embedded within the UK Defence Nuclear Enterprise, and over 950 personnel from the Australian Submarine Agency have received offshore nuclear safety training from the Royal Navy. This extensive training program underscores the commitment to ensuring Australia has a highly skilled workforce capable of safely and effectively operating nuclear-powered submarines.
Testing Interoperability and AI Capabilities
The visit isn’t solely focused on maintenance. During HMS Anson’s month-long stay, AUKUS partners will conduct combined activities under both Pillar I and Pillar II of the AUKUS agreement. These activities include testing the interoperability of the Australian Speartooth large uncrewed underwater vehicle (LUUV) with the UK SSN, and assessing and enhancing anti-submarine warfare AI algorithms fitted to the Royal Australian Air Force’s P-8A Poseidon aircraft. This integrated approach highlights the commitment to leveraging cutting-edge technology and fostering seamless collaboration between the three nations.
Deputy Prime Minister Richard Marles emphasized the significance of this collaboration, stating, “Australia’s acquisition of a nuclear-powered submarine capability will create jobs, strengthen our local industry and help keep Australians safe.” He further added that the Submarine Maintenance Period demonstrates the “continued momentum across all three partners to deliver AUKUS.”
Preparing for Submarine Rotational Force–West
The UK SMP represents a crucial milestone in the lead-up to the establishment of Submarine Rotational Force–West at HMAS Stirling, scheduled to begin in 2027. This rotational force will see US and UK nuclear-powered submarines regularly visiting Australia, providing further opportunities for training, and collaboration. The ultimate goal is for Australia to begin construction of SSN-AUKUS submarines in Adelaide by the end of the decade, marking a historic moment in the nation’s defense capabilities.
Minister for Defence Industry, Pat Conroy, highlighted the importance of building a skilled workforce, stating, “This is an important milestone that will build confidence in our strategic partners that we have the workforce able to deliver AUKUS submarines, and also lays ground for more jobs for locals.” He emphasized that AUKUS partners are “working together to achieve real operational benefits today, faster than we can working alone.”
The arrival of HMS Anson is more than just a logistical operation; it’s a tangible demonstration of the AUKUS commitment and a critical step towards bolstering Australia’s national security. The ongoing collaboration and knowledge transfer will be instrumental in preparing Australia for the challenges and opportunities of the future, ensuring a secure and prosperous Indo-Pacific region. The next key milestone will be the commencement of the Submarine Rotational Force–West in 2027, further solidifying the AUKUS partnership and Australia’s path towards acquiring a sovereign nuclear-powered submarine capability.
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