Churchill's Secret Bunkers

S1, E8: During World War Two a vast complex of secret bunkers was constructed under the streets of London. Lost to time, this world was an important refuge from the nightly onslaught of Nazi air raids, but only now can we reveal the full extent of the scheme. The existence of Churchill's bunker is no secret, but that there was an entire subterranean city, built to keep the British government running, is only now being revealed. Very little of this covert network, which also sheltered American General Dwight Eisenhower, has ever been revealed to the public. Now this lost world is brought back to life with cutting edge computer graphic technology. The tunnels beneath the heart of London's great buildings; the underground command center from where the Battle of Britain was co-ordinated; the deep level, ultra-secure chambers that could withstand the most deadly weapons in the Nazi arsenal. Beneath the sidewalk, this program exposes wartime secrets we were never meant to know.