Why are three of the UK’s four nuclear deterrent submarines at sea?
The deployment marks the first time in years that three Vanguard-class vessels have been at sea at the same time.

The deployment marks the first time in years that three Vanguard-class vessels have been at sea at the same time.




![An RAF Typhoon aircraft, seen here being prepared for operations across the Middle East, at RAF Akrotiri, Cyprus [Sgt Lee Goddard/ Handout/MoD Crown Copyright via Getty]](https://aljazeeranews-3fuh52rgrl.edgeone.app/wp-content/uploads/2026/10/getty_6ad86a6cc2-1792567916.jpg?resize=770%2C513&quality=80)




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