speculates that the rift leads to a buried prehistoric lake. Paula and Sam scuba dive to the bottom and discover a big cavern filled with large piranha egg stocks. Both are eaten by the piranhas before they can alert the others. Novak and Julie find Paula's corpse and pull it onto the boat, capturing a lone piranha, which they take to Carl Goodman, a retired marine biologist. He explains that this piranha is a super-aggressive prehistoric species known as Pygocentrus nattereri, or the Original Piranha, long believed to have been extinct for over 2 million years, and theorizes that the piranhas must have survived through cannibalism. The species is able to vigorously devour its prey in seconds. Julie, Novak, Fallon and Deputy Taylor Roberts try to evacuate the lake but their warnings are ignored until the piranhas begin to attack the tourists, turning the party into a bloodbath. Novak boards a jet-ski with a shotgun to help while the rest of the team try to save the others. Almost everyone in the lake is either brutally wounded or killed by the piranhas, including Todd, whose boat capsizes as he attempts to escape. Fallon makes a last stand, taking a boat motor and using its propeller as a makeshift chainsaw to kill some of the piranhas, but he loses his legs in the process. Meanwhile, Jake spots Laura and Zane on the island and forces Derrick to rescue them. Derrick accidentally crashes the boat into some submerged rocks in the process, flooding the lower deck and causing the boat to begin sinking. Kelly is trapped in the galley while Derrick, Crystal and Andrew fall overboard. Andrew escapes to the shore, but Crystal is devoured and Derrick is badly wounded. Danni manages to get a partially-eaten Derrick back on board, where he eventually dies. Julie and Novak reach Jake on a speedboat and attach a rope to his boat. Julie, Danni, Laura and Zane start crossing the rope, but the piranhas latch onto Danni's hair, causing her to fall into the water, where she is ripped apart and devoured. The others make it across safely, but the rope comes loose. Jake ties the line to himself and goes to save Kelly. He ties her to him and lights a flare after releasing the gas from stored propane tanks. Novak speeds the boat away just as the piranhas surround Kelly and Jake. They