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Dr. Jeremiah Morley (Victor Kilian) is concerned about an imminent nuclear war. He theorises that mankind could save itself during an attack by resettling far beneath the earth’s surface. To prove his theory, Morley builds the ‘Cyclotram’, a combination drill and exploratory vehicle, with the financial assistance of playboy Wright Thompson (Bruce Kellogg), who insists upon joining the expedition to the earth’s core.
After several adventures, the Cyclotram and its surviving passengers reach a cavern nearly 2000 miles beneath the surface. The cavern contains all the necessities of survival save one: the atmosphere renders anyone living within its walls sterile. Deciding that it isn’t worth hiding in the centre of the earth if only one generation will survive, the explorers attempt to get back to the surface – but who will survive this journey?