The others make it across safely, but the rope comes loose.
Using Derrick’s corpse as a distraction, Jake ties the line to himself and goes to save Kelly.
Julie and Novak steal a speedboat and head off towards the kids. Julie, Danni, Laura, and Zane start crossing the rope, but the piranhas latch onto Danni’s hair, causing her to lose her grip on the rope and fall into the water, where she is quickly devoured.
Julie, Novak, Fallon, and Deputy Taylor Roberts try to evacuate the lake, but their warnings are ignored, until the piranhas begin to fiercely attack the tourists.
Novak boards a jet-ski with a shotgun to help while Fallon drags people to shore, and Julie and Taylor try to get swimmers into the police boat.
He explains that it is a highly aggressive prehistoric species, long believed to be extinct, and that the piranhas have survived through cannibalism.
The species is able to vigorously devour its prey in seconds.