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Britain's secret Cold-War tunnels

London is filled with mysterious tunnels and underground chambers.

"In 2017, newly published Land Registry data revealed 4 million km of networks and telecommunications lines underneath London, many of which were secretly constructed by the Post Office, British Telecom and the Ministry of Defence."

http://www.bbc.com/travel/story/20201005-the-uks-rumoured-subterranean-network

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