Posted By Blake Hounshell Share

Peter Macdiarmid/Getty Images

Former British Telecom employee John Tasker stands in an old canteen in a secret air raid tunnel on Oct. 17, 2008 in London. The once-secret tunnels were built 100 feet under central London in 1940 as fully equipped air raid shelters and could accommodate 8,000 people. They have since been used by MI6 and the Public Records Office to hold 400 tons of secret documents. Current owner British Telecom (BT) once housed the London trunk exchange of the secure trans-Atlantic hotline between the presidents of the United States and the Soviet Union. BT is now seeking a buyer for the tunnels.

Read more about the tunnels here.

 

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