When the cable breaks on their diving bell four people find themselves trapped in a hidden underwater world.
as Prof. Millard Wyman
as Craig Randall
as Dale Marshall
as Paul Whitmore
as Lauri Talbott
as Dr. J.R. Matheny
as Old Man in the Caverns
as Jim Wyman
as Wilson, Sonar Man
as The Captain
as Hank
as Reporter
as Jimmy, Reporter
as Narrator
