Director/a
Jerry Warren
DIRECTOR/A
Reparto (por orden de créditos)
John Carradine
Prof. Millard Wyman
Robert Clarke
Craig Randall
Phyllis Coates
Dale Marshall
Allen Windsor
Paul Whitmore
Sheila Noonan
Lauri Talbott
George Skaff
Dr. J.R. Matheny
Maurice Bernard
Ingol - Old Man in the Caverns
Joe Maierhauser
Jim Wyman
Harry Raven
The Captain
Lloyd Nelson
Wilson - Sonar Man
Jack Haffner
Jimmy - Reporter
Milt Collion
Hank
Robert Carroll
Narrator(voice)
Lowell Hopkins
Reporter
Plane Passenger Behind Wyman(uncredited)