When the cable breaks on their diving bell four people find themselves trapped in a hidden underwater world.
Genres:
John Carradine as Prof. Millard Wyman
Robert Clarke as Craig Randall
Phyllis Coates as Dale Marshall
Allen Windsor as Paul Whitmore
Sheila Noonan as Lauri Talbott
George Skaff as Dr. J.R. Matheny
Maurice Bernard as Old Man in the Caverns
Joe Maierhouser as Jim Wyman
Lloyd Nelson as Wilson, Sonar Man
Harry Raven as The Captain
Milt Collion as Hank
Lowell Hopkins as Reporter
Jack Haffner as Jimmy, Reporter
Robert Carroll as Narrator
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