They continue to follow the "Kiang Ching" to an island. Jones and Montel land to investigate, but Montel is disappointed by the low radioactivity levels he detects. After a firefight with Red Chinese soldiers, the patrol returns to the submarine with a captive. They learn the location of another island from the prisoner, a pilot named Ho-Sin. During a storm en route, Montel is injured. Because he is too hurt to go ashore, Montel insists Jones take Denise in his place; she is the only other person qualified to gather and interpret the required data. Denise detects an extremely high level of radioactivity and is forced to shoot and kill a Chinese soldier who stumbles upon her. Back aboard the submarine, Jones is worried because he recognized an American B-29 bomber (a Soviet-built Tupolev Tu-4 copy in U.S. markings) sitting on an airstrip. Needing more information, they trick it out of Ho-Sin. They place the ship's cook Chin Lee (Wong Artarne), dressed in a Chinese uniform and beaten by Jones at Chin Lee's insistence, into the same room. Fooled, the captive reveals that the aircraft is going to drop an atomic bomb on either Korea or Manchuria the next day, with the blame placed on the United States. Chin Lee slips up and Ho-Sin beats him to death before Jones can intervene. Jones decides to go ashore and watch for the bomber's takeoff. When he signals, the submarine will surface and try to shoot it down. Montel, however, sneaks onto the island in his place. When Jones scolds Denise for not stopping the old man, she tearfully reveals that Montel is her father. The submarine surfaces, and the crew opens fire with every weapon aboard on the heavily laden, low flying bomber. On fire, it turns back and crashes, detonating the atomic bomb, obliterating the island. In voice-over Montel's previous observation echos as the bomb's mushroom cloud rises: "Each man has his own reason for living and his own price for dying". Fuller agreed to direct the film after Darryl F. Zanuck agreed that he could rewrite the screenplay, provided that the original screenwriters, Jesse L. Lasky Jr. and Beirne Lay, approved Fuller's rewrite. Though he did not like the film, he accepted the assignment as a personal favor to Zanuck, who had defended Fuller against FBI Director J. Edgar Hoover's attack on the studio over Fuller's film "Pickup on South Street".