In the huge, labyrinthine nuclear bunker meant to shield the survivors in government from the aftermath of atomic war, Level 7 is the deepest and the safest from radiation. But in spite of its hermetic isolation, the nerve center of government is ultimately not safe from the consequences of the holocaust which rages miles overhead. Written by
Did You Know?
This episode was wiped by the BBC and for many years no copy of it was known to exist. However, a copy was returned to the BBC in 2006. See more