The crew of an experimental, high-tech submersible is called into action to investigate a mysterious nuclear submarine crash. A series of strange encounters leads the crew to suspect the accident was caused by an extraterrestrial craft, and that they may be participating in an encounter with an alien species. However, in order to make contact, they must not only brave the abyss, an exceedingly deep underwater canyon, but also deal with the violent actions of one of their own crew members, an increasingly paranoid Navy SEAL officer.
