Set against the eerie backdrop of World War II, the USS Tiger Shark embarks on a seemingly standard rescue operation beneath the ocean's depths. However, as the beleaguered crew navigates the cramped confines of the submarine, they find themselves spiraling into a nightmarish exploration of psychological turmoil. Their minds become battlegrounds of haunting illusions, deceptive fears, and overwhelming anxiety, revealing the darker realities lurking beneath the tranquil surface of the sea.