Deep Blue Sea is a 1999 American science fiction horror film directed by Renny Harlin. It stars Saffron Burrows, Thomas Jane, Samuel L. Jackson, Michael Rapaport, and LL Cool J. Set in an isolated underwater facility, the film follows a team of scientists and their research on mako sharks to help fight Alzheimer's disease.
Released in theaters during the summer season, Deep Blue Sea grossed over $165 million worldwide. It received generally mixed reviews from critics, who praised its suspense, pacing, and action sequences, but criticized its unoriginality and B movie conventions. Retrospectively, Deep Blue Sea has been regarded as a successful shark film, especially within a limited genre that has been dominated by Steven Spielberg's 1975 thriller Jaws. A direct-to-video sequel, Deep Blue Sea 2, was released in 2018. A third film, Deep Blue Sea 3, was released on July 28, 2020.