Dr. Jerimiah Morley believes the world is headed to a worldwide nuclear war. He organizes an expedition made up of a team of expert scientists and an atomic-powered rock-boring vehicle called a "cyclotram" to find a subterranean environment where holocaust survivors could live indefinitely. Millionaire adventurer Wright Thompson finances the project -- under the condition that he be allowed to go. As the group goes deeper into the earth the journey claims the lives and causes personalities to clash. Finally the discovery of an enormous underground habitat with its own ocean and phosphorescent light is made and it appears that their goal has been achieved. But has it?