Drilling into the forbidding depths of the earth!

With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.

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Main Cast: Bruce Kellogg, Otto Waldis, Jim Bannon, Tom Handley, Dick Cogan, George Baxter, Marilyn Nash, Victor Kilian

Director: Terry O. Morse

Writer: Millard Kaufman

Editor: Terry O. Morse

Cinematographers: Henry Freulich, Allen G. Siegler

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