The casting was aimed to capture a varied audience. Avalon sings in two musical interludes, which were shot in color despite the fact that the rest of the film is black and white. The sub's commander is ordered to stop to pick up an underwater demolition team led by Lt. Hayes whose mission is to locate and destroy an American submarine that had sunk in a lagoon off Bikini Atoll before the Japanese are able to raise it and capture the advanced radar system on board. Malzone carries a photo of his girl, which he affixes to the torpedo above his bunk. Upon arriving at the atoll, the demolition team meets up with a local band of guerrillas , including native interpreter Paul and the buxom Reiko. After Paul is killed by a Japanese patrol, a romance develops between Reiko and Hayes, or possibly Malzone.