Novak speculates that the rift leads to a buried prehistoric lake.
Kelly is trapped in the kitchen while Derrick, Crystal and Andrew fall overboard from the impact of the collision.
Crystal is devoured, and Andrew escapes to shore unharmed.
Almost everyone in the lake is either wounded, dismembered, or killed by the piranhas altogether, while the remaining surviving tourists escape. Meanwhile, Jake spots Laura and Zane on the island and forces Derrick to rescue them.
Derrick crashes the boat into some rocks, flooding the boat’s lower deck and causing the boat to begin sinking.
He ties Kelly to him and lights a flare after releasing the gas from a pair of stored propane tanks.