A network of hidden spy tunnels used by Winston Churchill's Secret Army could soon become 's next big tourist attraction under a £220million scheme.The mile-long set of secret, subterranean pathways known as the Kingsway Exchange lies beneath High Holborn and was built to shelter Londoners during the Blitz.Measuring 25ft in diameter - the equivalent of three London buses - the exchange was expanded at the onset of the Cold War in the 1950s and ran the world's first Transatlantic telephone cable - used for a 'hot line' linking the to the Kremlin.
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