A shell-shocked US submarine crew embarks on a routine mission in the Pacific during the Second World War. After stopping to pick up the three survivors of a torpedoed British hospital ship, an unrelenting series of terrifying and sinister events drives the crew into madness as they wander the claustrophobic corridors of their cramped vessel. Horror, starring Olivia Williams, Holt McCallany, Bruce Greenwood and Matthew Davis.

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.