
Mike and Tony Petrakis are a Greek father and son team who dive for sponges off the coast of Florida. After they are robbed by crooks, Arnold and the Rhys brothers, Mike decides to take his men to the dangerous 12-mile reef to dive for more sponges. Mike suffers a fatal accident when he falls from the reef leaving Tony to carry on the business. But now he has a companion, Gwyneth Rhys.
Cast

Robert Wagner
Tony Petrakis

Terry Moore
Gwyneth Rhys

Gilbert Roland
Mike Petrakis

J. Carrol Naish
Socrates Houlis

Richard Boone
Thomas Rhys

Angela Clarke
Mama Petrakis

Peter Graves
Arnold Dix

Jay Novello
Sinan

Jacques Aubuchon
Demetrios Sofotes

Gloria Gordon
Penny Petrakis

Harry Carey, Jr.
Griff Rhys

Rock Hudson
Narrator (uncredited)
Jack English
Doctor (uncredited)

William Johnstone
Crewman of 'Snapper' (uncredited)
Crew
Robert D. Webb
Director

A.I. Bezzerides
Writer
William Reynolds
Editor

Edward Cronjager
Director of Photography
Darryl F. Zanuck
Executive Producer
Robert Bassler
Producer

Dorothy Jeakins
Costume Design
Ben Nye
Makeup Artist

Bernard Herrmann
Original Music Composer
Fred J. Rode
Set Decoration
George Patrick
Art Direction
Lyle R. Wheeler
Art Direction
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