Talented special effects and adventure director Michael Anderson (Around the World in 80 Days, 1956) keeps the suspense going in this drama about the wreck of the Mary Deare. John Sands (Charleton Heston) is the captain of a salvage ship that is almost rammed by the apparently abandoned Mary Deare. Sands boards the ship in search of plunder but as it is tossed on the high seas, he discovers a half-crazed captain aboard (Gary Cooper). The captain of the Mary Deare, Gideon Patch, tells Sands his story and in the end, the ship is scuttled and sinks. While Sands believes the story, the court does not believe it and Captain Patch is devastated. Determined to prove his innocence, the two captains dive down to the sunken Mary Deare to dredge up the evidence they need - building up to a slam-bang climax.