Genre: Documentary, History, Science
Premise: A camera crew descends hundreds of feet below the streets of major cities -- such as New York, Cairo, London and Tokyo -- to explore the layered remnants of civilizations left buried deep under modern metropolitan centers.
S01, E08 (First Aired: Jun. 11, 2007)
The subterranean secrets below London's most famous landmarks; Winston Churchill's hidden war-rooms; host Eric Geller.
S03, E02 (First Aired: Nov. 2, 2008)
Host Don Wildman discovers what it was like to live through World War II's Battle of Okinawa by exploring the Japanese defenders' tunnels, caves and bunkers; diving to a destroyer sunk off Okinawa's coast.