In a remote and mysterious archipelago, a group of tourists embarks on an exploration trip on a yacht, unaware of the terrifying history woven into the waters. What begins as a relaxing adventure soon turns into a nightmare when they discover an ancient sunken ship, a remnant of World War II. While exploring the wreck, they unleash an unimaginable force: an army of aquatic creatures, resurrected German soldiers transformed into lethal mermen.
As the group struggles to survive, tension rises as they begin to disappear one by one, devoured by the horror lurking at the bottom of the ocean. With limited resources and communication cut off, their attempts to escape are thwarted by the hostile environment and their own paranoia. In the face of imminent danger, you will witness how loyalties, fears, and hidden secrets unravel among them.
A couple of survivors become the group's leaders, trying to devise a plan to escape alive and deal with the creatures that come from the abyss. As the island turns into a battleground for survival, the characters must make difficult decisions, facing not only external horrors but also their own inner demons. In a life-or-death game, time runs out and uncertainty transforms into terror. Will anyone manage to escape this aquatic prison?