On an annual extreme outdoor adventure, six women meet in a remote part of the Appalachians to explore a cave hidden deep in the woods. Far below the surface of the earth, disaster strikes when a rockfall blocks their exit and there's no way out. The women push on, praying for another exit, but there is something else lurking under the earth. The friends are now prey, forced to unleash their most primal instincts in an all-out war against an unspeakable horror -- one taht attacks without warning, again and again and again.
Won: Best Horror, 2005 British Independent Film Awards; Best Horror Film, 2007 Academy of Science Fiction, Fantasy & Horror Films; Best Director, Best Technical Achievement, 2005 British Independent Film Awards
Combines grisly images with mind games, and the result is something truly disturbing. Marshall is a director that knows how to make a bad horror movie look good... and that's what's really scary.