United Kingdom Will Start SSN-AUKUS Submarine Construction in 2027
Steel cutting for the first of the new attack submarine class will begin in 2027 to replace the aging Astute fleet.
Updated on Sept. 22, 2026 in Nuclear
Live Poll
Should the government prioritize large-scale funding for national military-industrial submarine programs?
The United Kingdom has scheduled the initial steel cutting for its new SSN-AUKUS attack submarine program for 2027. This initiative aims to modernize the nation's naval capabilities by replacing the current fleet of seven Astute-class submarines.
Why it matters
The SSN-AUKUS program is designed to meet critical strategic requirements for both NATO and Indo-Pacific operations. By developing these vessels through international collaboration, the UK and Australia aim to maintain a significant long-term underwater deterrent.
The new SSN-AUKUS boats will replace the existing seven Astute-class submarines, which measure 318 feet long and displace 7,400 tonnes. The production program is expected to support 21,000 specialized jobs across the United Kingdom.
The players
BAE Systems
This global defense, aerospace, and security company is the primary contractor responsible for the construction of the UK's next-generation submarine fleet.
Rolls-Royce Submarines
A division of the British industrial giant, this entity specializes in the design and manufacture of nuclear propulsion systems for the Royal Navy.
The details
Developed with US technology, the SSN-AUKUS program utilizes specialized nuclear propulsion technology provided by Rolls-Royce. Construction will occur at BAE Systems in Barrow-in-Furness, while Australia will simultaneously establish production capabilities at Osborne.
Timeline
Steel cutting for the first SSN-AUKUS submarine is scheduled for 2027.
The new vessels are expected to enter service during the late 2030s.
The strategic service life objective for the new fleet spans from the 2030s through the 2070s.
The Big Picture
The SSN-AUKUS program follows the mandate set by the AUKUS security partnership between Australia, the United Kingdom, and the United States. This industrial collaboration represents a foundational shift in how the three nations share sensitive nuclear propulsion technology for strategic defense.
The program is expected to sustain 21,000 specialized jobs throughout the project's development and construction phases. While these vessels are naval assets, the development of shore-testing infrastructure like SMITE2 signals ongoing investment in local high-tech manufacturing hubs.
The takeaway
The transition to the SSN-AUKUS platform ensures that the UK remains capable of operating high-end attack submarines well into the 2070s. This multi-decade industrial project highlights the increasing reliance on international supply chains and shared technology to meet modern maritime security goals.
Further reading
Learn more about the latest developments in the Nuclear sector.
Source note: This article includes information reported by 19FortyFive.
Live Poll
Should the government prioritize large-scale funding for national military-industrial submarine programs?
