On a remote island in the Pacific, a group of scientists embarks on an expedition to study mysterious phenomena in a series of subterranean caves. Their goal: to unravel the secrets of the region and perhaps discover something spectacular. However, they will soon realize that the place hides an unsuspected danger. After a series of strange and deadly events, the researchers become aware that they have awakened an ancient evil: gigantic mutant crabs that, in their quest to survive, have acquired the ability to absorb and replicate the abilities of those they devour.
With time running against them, the scientists must confront these monsters that threaten not only their lives but also their sanity. As they delve deeper into the island, they discover that each death seems to make the creatures stronger and more cunning. What had begun as an exciting scientific adventure turns into a desperate struggle for survival. Tension mounts as the crabs begin to use the voices and intelligence of the people they have devoured, unleashing chaos among the group members, who soon find themselves engulfed in paranoia and despair.
Time is running out, and with each step, the group faces a terrifying reality: to defeat these monsters, they must not only find a way to eradicate them but also confront their own deepest fears. The fight to get back home becomes an epic battle against a wild nature filled with surprises.