After receiving a distress call from another submarine off the coast of Syria, the crew of the U.S.S. Nebraska searches a series of massive caverns. There they discover a shipwrecked, 70-year-old Soviet sub whose crew died under mysterious circumstances. While investigating the mystery of the sub's demise, the away team for the Nebraska discovers a massive underground sanctum dedicated to Mot, the ancient Ugarit god of death. As mysterious events start to occur onboard, the away team soon discovers that the sanctum was not constructed to worship Mot...it was built to imprison him! Now they must find a way to escape the death god's prison without freeing him to wreak destruction upon the world!