Beneath the 12-Mile Reef

Mike (Gilbert Roland) and Tony Petrakis (Robert Wagner) are Greek American father and son sponge diving entrepreneurs. They find themselves in competition with the Rhys family, Conch fishermen who are prepared to resort to violence and even murder to maintain their established fishing grounds off the Gulf Coast of Florida. Further complications ensue when Tony meets Gwyneth Rhys (Terry Moore), and the two fall in love.