Carcharodon megalodon - apex predator of all time, the most fearsome creature that ever lived - a 70-foot, 60,000 pound Great White Shark. Hundreds of 7-inch serrated teeth filled jaws that could swallow an elephant whole. It could sense its prey miles away, inhaling its scent as it registered the beat of its fluttering heart, and if you ever came close enough to see the monster . . . it was already too late. For Navy deep-sea submersible pilot Jonas Taylor, it nearly was too late. Years ago, on a top-secret dive seven miles down into the Mariana Trench, Jonas came face to face with an ancient monster everyone believed extinct. Having barely escaped with his life, Jonas must prove to the world that Meg still exists. When an opportunity to return to the trench presents itself, he takes it, intent on returning topside with a 7-inch white tooth But man's presence in this unexplored domain releases one of the sharks from its purgatory, and now Jonas is the only one who can stop it.