As a storm hits the Atlantic Ocean during World War II, an American submarine becomes the setting for a tense psychological game among the crew. The initial mission to rescue a group of shipwrecked survivors quickly transforms into a fight for survival as inexplicable events begin to occur on board. With fear lurking in every corner of the submarine, the lesson that war can bring not only enemies on the battlefield becomes evident.
With a heavy and unsettling atmosphere, the crew members must confront their own internal demons while trying to maintain their sanity in a claustrophobic environment. Trapped underwater and far from sunlight, unsettling sounds and shadows that seem to come to life intensify the paranoia. The suspense escalates as ghostly visions begin to appear, challenging each crew member's perception of reality.
The situation becomes even more complicated when a new addition, a young sailor with a dark past, enters the equation. Tension rises and betrayals unravel as they struggle to discern what is real and what is not. In a battle against both supernatural and psychological forces, the decisions they make could be the ultimate test of courage and humanity in the depths of the ocean.