Our protagonist WuShi and his friends are onboard a highspeed rail train, which is a tourist attraction that goes through the belly of the sea. Will you become everyone's salvation. A train shuttling underwater carrying students and teachers on a graduation trip is suddenly trapped in a strange time loop, endlessly experiencing the moment of a derailing accident. Enter a bloody cycle of fate deep under the ocean. What they do not know is that once upon a time, the train is a vehicle for.
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