The film tells the story of six young men and women who were trapped at sea after being attacked by sharks, and struggled to save themselves when they ran out of ammunition and food and had no help. Liu Wei, An Qi, Su Fei, Li Zhihui, An Jie and Ouyang Xiaomin drove a private yacht out to sea. Unexpectedly, the yacht hit a reef and capsized in the middle of the sea, and everyone fell into the sea. At the same time, due to the pollution of the marine environment, the sharks' genes mutated, and a group of giant and violent man-eating sharks were bred. A life-and-death game between people and sharks began.