Saw this last night. This is a top-notch horror film. I wish they had kept the original ending (you can find it on YouTube, but wait until you've seen the movie), but I still give it props for some quality horror/suspense. The premise sounds silly - 6 hot chicks on a spelunking adventure. But, it works well. Lots of good shocks, and the claustrophobia and the scary crap they run into down there make for a lot of fun.