A relaxing weekend on the water leads to tropical terror for a group of young seafarers who stumble across an ancient and deadly secret. Shortly after a group of archeologists vanish without a trace on a secluded tropical island, a ship capsizes in the waters nearby, and its frightened passengers swim to the beach for safety. But this secluded paradise is no island sanctuary - it's a hunting preserve for a prehistoric tribe of predators that prey on humans. They've slaughtered the archeologists, and now they've got a new group to hunt.