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The Kelvedon Hatch Secret Nuclear Bunker was designed for up to 600 military and civilian personnel, including the Prime Minister, their collective task being to organise the survival of the population in the aftermath of a nuclear war. It was built into the side of a hill, was three storeys high, and you entered through a disguised bungalow at the lowest level and worked your way up. To the right of the 150 feet high radio mast the low structure was an emergency exit and fresh air duct.