In the late stages of the Anti-Japanese War, the defeat of the Japanese invaders was certain, and they decided to build a submarine base in Hong Kong as a final resistance. Zuo Teng (played by Zhao Wenxuan), who studied construction engineering before joining the army, is responsible for the technical work of the base, and Captain Hei Shou (played by Wang Guojing) serves as the security guard of the base. The neutral cargo ship "Aunt Mary" was forcibly requisitioned by the Japanese army, and the sailors on the ship were taken to the base to work as laborers. Among them were sailor He Weili (played by Xia Jun), his wife Zheng Ling (played by Jiang Zhujing), and his girlfriend Xu Meili (played by Wan Bixia). Under the armed supervision of the Japanese army, workers worked overloaded every day, and sick workers were secretly burned to death. Witnessing this tragedy, He Weili was eventually frightened and went crazy. The sailor Guan Xiong (played by Wang Yanan) who tried to escape was beaten to death by Heishou using a motorboat propeller. Captain Hongda (played by He Lin) plans to escape, and his plan is understood and supported by foreign engineer Mason (played by John Slade). At this time, as the completion of the project was approaching, the Japanese military command ordered all the workers to be killed...
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