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Since witnessing the death of his wife in a shipwreck, Zhang Yang, who has spent half of his life at sea, vowed never to set foot in the ocean again. However, on his daughter's 12th birthday, Zhang Yang, who could not resist his best friend's persuasion to fulfil his daughter's wish, broke his vow and participated in a sea smuggling and embarked on an ocean liner that was no different from a steel prison. At the same time, a horrible accident happened, a deep sea monster that has never been seen before has escaped from the ship's laboratory. With the genes of the natural predator, the human on board launched a merciless hunt, will all be put to the test of survival. (Source: iQiyi)