Britain will cut steel on the first SSN-AUKUS in 2027 to replace the Astute-class and the same BAE Barrow yards must still finish Astutes, build four Dreadnought SSBNs, and fix a fleet that has at times had all five Royal Navy attack boats unavailable - 19FortyFive

The article documents a critical bottleneck in the AUKUS submarine supply chain: BAE Barrow yards must simultaneously complete Astute-class builds, manufacture four new Dreadnought SSBNs, and now initiate SSN-AUKUS construction—all while the Royal Navy has experienced catastrophic availability (all five operational attack boats offline at times). A 2027 first-steel date for Australia's first SSN-AUKUS submarine is now the public commitment, but the revealed industrial and maintenance crisis at Barrow threatens the credibility of this schedule and raises the probability of further delays that could push Australian submarine delivery beyond the 2040s deadline.