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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 side of the city.

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  • Premieres Sunday, June 22, 2014 at 8:00 p.m. ET/PT. Check your local listings.



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