Cities of the Underworld Season 1 Episode 8

For thousands of years London has been among the most powerful cities in the world, below the busy streets and marketplaces another city hides–a city of Roman baths, secret crypts, lost rivers, indestructible bunkers that could hold up to 8,000 people, Winston Churchill’s hidden war-rooms; host Eric Geller.

Episode Title: London's Lost Cities

Air Date: 2007-06-11