|Episode Online Video|
S01, E08 (First Aired:
The subterranean secrets below London's most famous landmarks; Winston Churchill's hidden war-rooms; host Eric Geller.
S03, E02 (First Aired:
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.
S01, E09 (First Aired:
Exploring the neighborhoods, banks, bakeries and other structures carved beneath Naples by ancient Neopolitans.
S02, E13 (First Aired:
Host Don Wildman digs into the subterranean world of Cold War secrets in Ukraine, where the former Soviet Union stockpiled nuclear weapons, established submarine bases and built underground apartment blocks.
S02, E03 (First Aired:
Technology beneath the streets of Tokyo is to protect the city from natural disasters; Hiroshima's underground affords shelter from World War II's most powerful bombs; the secret life of Japanese ninjas.