When a nuclear submarine sinks, a team of divers descends the depths to determine the cause in this sci-fi thriller from writer-director James Cameron. But during the investigation, it becomes evident that an extraterrestrial power is at work. Led by Bud Brigman (Ed Harris), the crew includes Brigman's estranged wife (Mary Elizabeth Mastrantonio) and a paranoid Navy lieutenant (Michael Biehn). The film scored an Oscar for Best Visual Effects.