New Navy submarine HMS Dreadnought on the move as largest section is completed

A huge section of the Royal Navy's new HMS Dreadnought submarine has been on the move.

Protected by what the Navy called "the world's largest black bin bag", the biggest segment completed to date moved through the streets of Barrow-in-Furness from BAE systems' fabrication facility to the Devonshire Dock Hall.

BAE Systems has not moved a submarine section of this size – it is 22 metres long – through the Cumbrian town in 30 years.

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The section will make up the first of the Submarine Service's next-generation strategic deterrent, with an additional three subs set to be built.

Dreadnought will be the first, with HMS Warspite and Valiant already under construction, while work is yet to begin on the fourth sub, HMS King George VI.

All the submarines will be assembled undercover in the Devonshire Dock Hall which is 260m long, 54m wide and 51m tall – making it almost large enough to accommodate the Titanic.

The final two Astute-class submarines, HMS Agamemnon and Agincourt are also in the latter stages of being assembled in the hall.

Dreadnought is set to enter service in the early 2030s, with the V-boats starting to retire after four decades carrying out Operation Relentless, the UK's strategic nuclear deterrence mission.