Three of UK's four nuclear submarines deployed at sea

Summarised from 2 outlets · Updated 27 Oct, 19:58 · Archive

Three of Britain's four nuclear deterrent submarines are out at sea simultaneously, according to reports. A Navy source described the deployment as 'unusual' but declined to give reasons for the move. At least one submarine is understood to be carrying ballistic missiles armed with nuclear warheads, while experts believe the other two could be conducting sea trials and preparing for future operations.

The Royal Navy operates four Vanguard-class submarines—HMS Vanguard, HMS Victorious, HMS Vigilant and HMS Vengeance—which carry the Trident missile system. The remaining submarine, HMS Victorious, is currently undergoing deep maintenance in Devonport. Under the UK's Continuous At-Sea Deterrent policy, at least one nuclear-armed submarine remains on patrol at all times.

A former senior naval source told The Times that the Royal Navy had been operating in '2BA' for a prolonged period, referring to the availability of two boats at any one time. The fleet's availability has been affected by lengthy maintenance periods, and patrols have grown longer, with one submarine returning after a record 205 days at sea in 2026. The Royal Navy has declined to confirm the submarines' tasks, citing security reasons.

Three of UK's four nuclear submarines deployed at sea — Image: The Mirror

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How it is being reported

Three of Britain's four nuclear submarines put to sea with one 'carrying warheads'Three of Britain's four nuclear deterrent submarines are reportedly out at sea at the same time in what one Navy source has described as an 'unusual' moveThe Mirror · 27 Oct, 19:34
Three of UK's four nuclear submarines out at seaThree of the UK's four nuclear deterrent submarines are out at sea, it is understood.Sky News · 27 Oct, 16:48

In this story: Royal Navy · UK · HMS Vanguard · HMS Victorious · HMS Vigilant · HMS Vengeance · NATO · Devonport

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