Leviathan (1989) | George P. Cosmatos

Scientists on the last few days of their stint in a deep sea mining operation stumble upon a mysterious Russian ship, "Leviathan", which has sunk and perhaps was ambushed by their own navy.  They loot some cargo on board and inadvertently bring back the remnants of a genetic experiment gone awry, which they also set loose upon their own vessel, to gruesome and nightmarish results. Peter Weller, Amanda Pays, Richard Crenna, Daniel Stern, Ernie Hudson, and Hector Elizondo appear in this film directed by George Cosmatos.