Due to changes in ocean currents, shark activity appeared near a certain diving area, but the traces are unknown. The hungry shark is ready to move, waiting for an opportunity to start a merciless killing. Doctor Shen Xin was invited.

A group of friends on vacation steal a couple of jet skis for fun and race them out to sea, ending up in a head-on collision. They struggle to find a way home with a badly injured friend, while from the waters below predators lurk.