After witnessing his wife's death in a shipwreck, Zhang Yang, who has spent half his life making a living at sea, vowed never to set foot in the ocean again. However, on his daughter's 12th birthday, Zhang Yang, in order to fulfill his daughter's wish, could not resist the persuasion of his friends and broke his oath to participate in a maritime smuggling and boarded an ocean-going freighter that was like a steel prison. At the same time, a horrible accident occurred. A deep-sea monster that had never been seen before escaped from the laboratory on the ship, and with its natural hunter genes, it launched a ruthless hunt on the humans on the ship, putting everyone in a test of survival.