AllMovie

The Seaview is assigned to investigate an uninhabited volcanic island in the Pacific, where men from an American submarine sunk In July of 1945 may have survived. Admiral Nelson (Richard Basehart) and a new crewman, Werden (Robert Doyle), scout the island in the Flying Sub and get caught in an underwater current that flings them into the cavern with the WWII survivors. Those men, suddenly faced with the chance for rescue after 28 years, must each confront their own personal demons, none more so than Lt. Nakamura (Teru Shimada), who has survived with the hope that they would be rescued by representatives of the Japanese Empire. Nelson tries to secure the rescue of all concerned before the island's volcano erupts, only to learn that Werden has a deeply personal stake in confronting one of the men, and that Nakamura is prepared to sacrifice himself and all concerned to redeem his honor as a soldier and the honor of his country. Finally, it falls to Captain Crane (David Hedison) aboard the Seaview to use every ounce of skill he possesses as a sailor to effect the rescue of the admiral and the others.