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On the surface, London is a buzzing, modern metropolis—but underneath lies a secret, hidden world, all but forgotten by the millions of people above. This program uncovers 2,000 years of subterranean history: a world of ancient caves and perfectly preserved Roman remains; mysterious rivers and gruesome plague pits; impenetrable vaults and top-secret bunkers.
Aired: 6/22/2014 | 0:54:41 | Expires: 6/22/2024
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