The Incredible Petrified World 1959

Synopsis:

When the cable breaks on their diving bell four people find themselves trapped in a hidden underwater world.

Directed by: Jerry Warren
Written by: John W. Steiner
Runtime: 70 minutes
Tagline: See women trapped in fantastic caverns at the center of Earth!
Cast:
John Carradine
John Carradine
Prof. Millard Wyman 
Robert Clarke
Robert Clarke
Craig Randall 
Phyllis Coates
Phyllis Coates
Dale Marshall 
Allen Windsor
Allen Windsor
Paul Whitmore 
Sheila Noonan
Sheila Noonan
Lauri Talbott 
George Skaff
George Skaff
Dr. J.R. Matheny