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.
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| Editing | William Reynolds | Editor |
| Writing | A.I. Bezzerides | Writer |
| Directing | Robert D. Webb | Director |
| Camera | Edward Cronjager | Director of Photography |
| Production | Robert Bassler | Producer |
| Art | George Patrick | Art Direction |
| Production | Darryl F. Zanuck | Executive Producer |
| Costume & Make-Up | Ben Nye | Makeup Artist |
| Art | Lyle R. Wheeler | Art Direction |
| Art | Fred J. Rode | Set Decoration |
| Costume & Make-Up | Dorothy Jeakins | Costume Design |
| Sound | Bernard Herrmann | Original Music Composer |
