Revised and Expanded new edition of the NY Times Bestseller. On a top-secret dive into the Pacific Ocean's deepest canyon, Jonas Taylor found himself face-to-face with the largest and most ferocious predator in the history of the animal kingdom. The sole survivor of the mission, Taylor is haunted by what he's sure he saw but still can't prove exists - Carcharodon megalodon, the massive mother of the great white shark. The average prehistoric Meg weighs in at twenty tons and could tear apart a Tyrannosaurus rex in seconds. Taylor spends years theorizing, lecturing, and writing about the possibility that Meg still feeds at the deepest levels of the sea. But it takes an old friend in need to get him to return to the water, and a hotshot female submarine pilot to dare him back into a high-tech miniature sub. Diving deeper than he ever has before, Taylor will face terror like he's never imagined. MEG is about to surface. When she does, nothing and no one is going to be safe, and Jonas must face his greatest fear once again.