You were once required to sign the Official Secrets Act to enter the building, now it’s open for visitors to freely explore the immense bunker.

The labyrinth of rooms and offices is a precious time capsule and although the 300 war time staff have long gone, a visit to the museum will transport you back to that time and make you ask questions about the people who once worked there.

Self-guided tours take approx 1 – 1.5 hours

This includes time for hot drinks and biscuits available at war time prices. Guided tours can also be pre-booked at £20 per group (up to 35 people), with a concessionary rate of £9 per person.

Walk through hidden rooms and discover the stories locked in the WW2 bunker that protected the tactics of the British Armed Forces plotting to bulwark the Western Approaches and aid the Allied victory.

Glimpse the documents and tools the Forces used to monitor enemy convoys and inform the British government of their findings, whilst keeping their intelligence secret from the enemy, including one of only two surviving wartime phones which had a direct connection to the London War Cabinet.

See where Commanders, WRNS and WAAF personnel worked day and night in the Operations Room, the nerve centre of the Battle of the Atlantic. Here they monitored convoy routes and vital shipping lines, pin-pointing enemy locations on a huge map wall, where total accuracy was necessary to enable the Royal Navy to contact and destroy the enemy.

The Operations Room has remained exactly how as it was left when the doors were closed on 15 August 1945.

Click here to read a travel review of a visit to the bunker.

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If one were to choose a building where the second world war was won, the white house or the admiralty rooms in London might be a possibility, or one might very well choose Derby house in Liverpool.

David Fairbanks White : Bitter Ocean