Drilling into the forbidding depths of the earth!
Unknown World
With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.
Terry O. MorseDirector
Millard KaufmanScreenplay
Top Billed Cast
Bruce Kellogg
Wright Thompson, Jr.
Otto Waldis
Dr. Max A. Bauer
Jim Bannon
Andrew "Andy" Ostergaard
Dick Cogan
Dr. George Coleman
George Baxter
Carlisle Foundation Chairman
Marilyn Nash
Dr. Joan Lindsey
Victor Kilian
Dr. Jeremiah Morley (uncredited)
