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.
You can now watch Beneath the 12-Mile Reef online on the following streaming providers in the United States.
| Editing | William Reynolds | Editor |
| Directing | Robert D. Webb | Director |
| Camera | Edward Cronjager | Director of Photography |
| Production | Robert Bassler | Producer |
| Writing | A.I. Bezzerides | Writer |
| Costume & Make-Up | Ben Nye | Makeup Artist |
| Art | Lyle R. Wheeler | Art Direction |
| Art | George Patrick | Art Direction |
| Production | Darryl F. Zanuck | Executive Producer |
| Costume & Make-Up | Dorothy Jeakins | Costume Design |
| Art | Fred J. Rode | Set Decoration |
| Sound | Bernard Herrmann | Original Music Composer |
