The Descent

Marshall spends the first hour on something other than horror — grief, guilt, the fault lines in a friendship — so that by the time the descent begins, the fear has somewhere to live. Then the cave closes in, and the film becomes one of the most physically frightening ever made about enclosed space, long before anything with teeth arrives. The monsters, when they come, are almost a relief from the rock. It is a horror film about descending into your own worst grief and finding it has been waiting for you in the dark.