During World War II, the crew of the USS Tiger Shark, an American submarine, is tasked with rescuing three survivors from a British ship. As they navigate through the Atlantic Ocean, the submarine is hunted by multiple German U-boats, creating an extremely tense situation. The crew must also face a mysterious and frightening force that seems to be chasing them in the depths of the ocean.
Trapped in the depths, the crew must confront enemies that threaten them from both the outside and the inside.
Will they succeed in surviving and completing their rescue mission? Or will they succumb to this mysterious force that relentlessly pursues them?