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

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
Ackmovie
This film is one of your typical late 50's B-Movies. The premise is **somewhat** believable, but just not enough. The direction is somewhat decent, but I've seen other, better B-movies. I found this in Wal-Mart on one of those Mill Creek compilation DVD's....
CinemaSerf
This could have made for quite a fun adventure, had the casting not been so terribly wooden! Four folks in a diving bell find them selves stranded in a network of caves. With now ay back to their colleagues on the surface, they must try to find a way out through the caverns - where they encounter th...