Leviathan (1989) is a science fiction horror film directed by George P. Cosmatos. Set in the deep sea, the film follows a group of underwater miners and scientists who are working on a salvage operation in the ocean floor. During their mission, they discover a sunken Soviet vessel and bring back some of its contents, including a mysterious and dangerous substance

Soon after, the crew begins to experience terrifying and grotesque transformations as the substance interacts with their bodies, leading to the emergence of a monstrous creature. As the crew fights to survive and escape, they must confront the horrific entity that has been unleashed and deal with the increasing paranoia and mistrust among them.

Leviathan combines elements of sci-fi and horror with an underwater setting, drawing comparisons to other genre classics like The Thing and Aliens. Known for its suspenseful atmosphere, practical effects, and creature design, the film explores themes of isolation, survival, and the unknown dangers lurking in the deep. It stars Peter Weller, Richard Crenna, and Amanda Pays, and is praised for its tense and gripping narrative.