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In the dark silence of the sea during World War II, the submarine USS Tiger Shark prowls on what should be a routine rescue mission. But for the shell-shocked crew, trapped together in the sub's narrow corridors and constricted spaces, this is about to become a journey into the sensory delusions, mental deceptions and runaway fears that lurk just below the surface of the ocean.

Claustrophobic corridors and the crushing weight of the ocean turn a routine rescue mission into a psychological nightmare. Paranoia leaks through every bulkhead as the crew struggles to distinguish real threats from the hallucinations born of isolation.

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