Deep in the Mariana Sea Trench, a corporate underwater mining complex has been built – an industrial Atlantis. When an accident in a dry-dock chamber kills several miners an investigator is sent to find the cause and immediately finds out that it was not an accident. He becomes caught in the middle of a deadly conflict between the miners and the corporation, and fights to stay alive and uncover the truth.

Five friends embark on a camping trip to sacred Native territory and are warned to stay away. When they choose to ignore the warning they are confronted with strange occurrences, seductive apparitions, vengeful locals and a deadly behemoth. Their weekend of fun becomes a descent into hell.