An engineer, a psychologist and several other disparate types take part in an experiment to see if people can live for extended periods of time in a city built under the ocean.
Bob Gage
Dr. Monica Powers
Tim Graham
Dr. Junius Halstead
Chuck Marlow
George Burnett
Phyllis Gatewood
Dotty Steele
Lt. Wally Steele
Meade (uncredited)
Dr. Carl Wendt (uncredited)
Author in Visiting Party (uncredited)
