A year after the cruel and tragic accident, six friends once again embarks on the annual adventure trip - this time to a remote part of the Appalachian mountain range, to take the descent into the cave system. Inside the cave is suddenly hit a disaster. The stones released during the landslide zatarasily the only exit and trapping them inside. The group after the discord divides, and each of the girls praying to find some other way out. But there is something else for them in the underground lurking - unknown species of large humanoid creatures that are perfectly adapted to life in the dark. The idea that it will soon become the prey of monsters, in the girls awakens the most primitive instincts and forcing them to do everything, to take in a total fight with the unspeakable horror that attacks without warning, again and again and again.