There’s a locked door on the eastbound platform of the Chancery Lane station of the London Underground. The door is unassuming, sturdy and white.
Behind it is a wide set of stairs leading to a roughly mile-long maze of tunnels built in the 1940s that were first intended to serve as a World War II shelter and later used for espionage, the storage of 400 tons of government documents and telecom services.
Welcome to the Kingsway Exchange tunnels, set roughly 100 feet below street level in the center of London, sprawling beneath the Underground’s Central Line. Soon…
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