UK Royal Navy lacks operational Astute attack submarines

The Royal Navy currently has no operational nuclear-powered attack submarines, with all five of its Astute-class hunter-killer boats docked for maintenance or technical issues. This unprecedented situation, confirmed by multiple reports in early June 2026, leaves Britain without a deployable vessel of this critical type for the first time in recent memory. A sixth Astute-class submarine, HMS Agamemnon, has been commissioned but remains in testing.

The Astute-class submarines are responsible for protecting the Vanguard-class ballistic missile submarines that carry the UK's Trident nuclear deterrent, conducting intelligence gathering, and performing anti-submarine warfare. Their absence creates a significant gap in underwater capabilities at a time when senior military officials have described the security environment as the most dangerous since the Cold War. Sir Richard Knighton, the Chief of the Defence Staff, stated last week that the risks and threats to the country are greater than he has known in his working life, citing Russian activity probing and testing defenses.

The vessels are undergoing various levels of planned maintenance, repairs, and upgrades. Senior naval figures...