Sanctum

I just watched the movie Sanctum with my mother and am extremely impressed with how well it was done. Also, I am never going to go spelunking and cave diving. For those of you who don't know what the movie is about, it is based on a true story where a group of cave divers are trapped in an underground cave system. To survive, they have to find a way out of the cave, which hasn't been previously discovered. They are trapped down there with a limited amount of food, light and air. I couldn't imagine anything more terrifying.