Leviathan

An underwater mining operation takes a deadly turn when the crew of an international facility discovers a Soviet shipwreck, Leviathan, containing a hideous mutant creature born from a genetic mutation and a mutagenic cocktail that includes vodka. As the crew members succumb to the mutations, they are stalked and killed by the monstrous creature in this tense, sci-fi horror thriller directed by George P. Cosmatos and starring Peter Weller.