FBI Agent Karl Helter and his partner Rebecca Lombardo are very close to busting a sex-trafficking ring. When they realize their investigation has crossed the path of a brutal serial killer, they team up with a Texas Ranger to put an end to the infamous 'Truck Stop Killer'.
Four teenage girls go on a diving adventure to explore a submerged Mayan city. Once inside, their rush of excitement turns into a jolt of terror as they discover the sunken ruins are a hunting ground for deadly great white sharks. With their air supply steadily dwindling, the friends must navigate the underwater labyrinth of claustrophobic caves and eerie tunnels in search of a way out of their watery hell.
