Secrets of Underground London

Re-aired March 2017

On the surface, London is a buzzing, modern metropolis--but underneath lies a secret, hidden world. Secrets of Underground London uncovers 2000 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. Dig deep to unearth some of the most extraordinary stories of the darkest

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