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.
Bruce Kellogg
Wright Thompson, Jr.
Otto Waldis
Dr. Max A. Bauer
Jim Bannon
Andrew "Andy" Ostergaard
Tom Handley
Dr. James Paxton
Dick Cogan
Dr. George Coleman
George Baxter
Carlisle Foundation Chairman
Marilyn Nash
Dr. Joan Lindsey
Victor Kilian
Dr. Jeremiah Morley (uncredited)
