In this thrilling, underwater action adventure from writer-director James Cameron (Titanic, Terminator 2: Judgement Day, Aliens), a civilian oil rig crew is recruited to conduct a search-and-rescue effort when a nuclear submarine mysteriously sinks. One diver (Ed Harris) soon finds himself on a spectacular odyssey 25,000 feet below the ocean's surface where he confronts a mysterious force that has the power to change the world or destroy it.