Researchers on the undersea laboratory Aquatica have genetically altered the brains of captive sharks to develop a potential cure for Alzheimer's disease. There is one unexpected side effect. The sharks are getting smarter. You can swim but you can't hide when a tropical storm floods Aquatica, plunging Samuel L. Jackson, Saffron Burrows, Thomas Jane, LL Cool J and the rest of the crew into a harrowing battle of wits against sleek killing - and thinking! - machines. Renny Harlin (Cliffhanger, Die Hard 2) directs, squeezing nerve-jangling suspense and thrills from a film that's a monster movie, a chase movie, a movie that snaps hold and won't let go. Dive in!