Leviathan (1989) is a science fiction horror film about a hideous creature that stalks and kills a group of people in a sealed environment, in a similar vein to such films as Alien (1979) and The Thing (1982). It is one of many underwater-themed movies released around 1989, including The Abyss, DeepStar Six, The Evil Below, Lords of the Deep, and The Rift (Endless Descent).

Plot

Tri-Oceanic Corp has hired a crew of undersea miners to do a 90-day mining operation. Martin hired Steven Beck, a geologist, to assist in mining operations as well as command the undersea mining station. While outside their vessel in a pressure suit, Sixpack trips and stumbles upon a wrecked ship. Because he doesn't respond to hails over his radio, Williams goes to look for him and finds him excited over "treasure." Dr. Thompson understands Russian and identifies the ship as the "Leviathan" from its markings. While checking on records of Leviathan, the crew discover that it is still marked as an active ship on duty in the Baltic Sea.

Meanwhile, Sixpack and the rest of the crew open a safe from The Leviathan and find several crew records relating to deceased crew members, as well as a video tape from the doctor of Leviathan. Among the materials, Sixpack finds a flask of Vodka. There being no alcohol on their own ship, he hides this for his own use later. Bowman figures out Sixpack has hidden away the Vodka and persuades him to share it.