Residents of a village are captured by an unknown armed group that starts experimenting on humans. However, the experiments fail. Therefore, the unsuccessful subjects are taken to the top of a mountain to be killed. Two of them, Arvin and Ejla, manage to escape and hide in a nearby pit. Unfortunately, the escapees are unaware that the deep muddy pit they fell is gradually beginning to turn into a giant grave for the victims of the experiments – who soon return from the dead…