Synopsis：To strengthen his bond with his daughter Buding (Zhang Yuyi), zoo manager Lin Haodong (Wei Wei) decides to take her on a luxury cruise aboard the "Ping'an" for a sea adventure. Unbeknownst to him, the voyage hides a terrifying truth: the ship's owner, Boss Wu (Guo Zhen), is an international smuggler using animal transport as a cover to illegally dump large quantities of heavily polluted wastewater into international waters for profit. The long-term discharge of this toxic waste has caused horrifying mutations in nearby marine life, giving rise to an extremely aggressive deep-sea serpent. As the cruise sails into this cursed sea, the giant snake awakens and launches a bloody attack. Facing this sudden disaster, Lin Haodong must unite all survivors, muster the courage to confront the giant serpent, and fight for his daughter's life and the slim hope of everyone's survival.