Secrets of Underground London
S1 E1 - 54m 41s
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.