On a daredevil caving holiday the six girls are trapped underground when an unexpected rock fall blocks their exit. Searching the maze of tunnels for a way out, they find themselves hunted by a race of fearless, hungry predators, once humanoid but now monstrously adapted to live in the dark? As the others battle for their lives, Sarah (Macdonald), still recovering from a mental collapse brought on by the recent deaths of her family, is fighting for her sanity. When old secrets are revealed, the group implodes as friends turn on one another. Betrayed and desperate, Sarah realises that to make it back to the surface, she must become as savage as the creatures themselves.
1hr 50min long
R16 Contains violence, offensive language & horror