WATCH: The Royal Navy rolls out its new sub - and she's almost as long as a football pitch
The 97-metre long attack sub HMS Audacious was edged from Devonshire Dock Hall in Barrow-in-Furness, Cumbria, ahead of sea trials expected to take place next year.
The 7,400-tonne BAE Systems-built vessel is the fourth of seven Astute class submarines and is armed with Spearfish torpedoes and Tomahawk land attack missiles.
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Hide AdThey were designed to be able to strike at targets up to 1,000km from the coast and are equipped with the latest sonar capability and powered by a nuclear reactor.
Three more Astute class submarines are at different stages in the building process in Barrow.