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