HMS Vigilant (S30)

As one of the four submarines which make up the UK’s nuclear deterrent, HMS Vigilant is far from a high-profile vessel – her top-secret duties mean she must ‘disappear’ on patrol for weeks on end.

HMS Vigilant (S30) is currently on deployment

Continuous at Sea Deterrent


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Facts & figures

Facts & figures

150 metres

Total length

25+ knots

Top speed

16,000 tonnes

Total displacement

Our base

Our base


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HMS Vigilant's role

HMS Vigilant is the third of the Royal Navy’s Vanguard-class nuclear powered ballistic missile submarines. Together with her sister vessels, she carries the UK’s strategic nuclear deterrent.

The deterrent patrol cycle carried out by the Vanguard-class began in 1969 – and has continued unbroken to this day.

Following a mid-life Long Overhaul Period Refuel, HMS Vigilant now has an upgraded reactor core, meaning that she has enough fuel to power her through the reminder of her working life. The overhaul also included significant upgrades to all her major machinery and operating systems.

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RT @HMNBPortsmouth: From Portsmouth ➡️ UK Waters ➡️ Norway ➡️ Scotland ➡️ The North Sea ➡️ Norway ➡️ Home for Christmas 🎄😄 10,100 nautical…