A group of brave girls, who love an active lifestyle, go to the mountains and find a mysterious cave. They don’t know what’s inside, so they enter and the exit gets blocked by rocks. The girls try to find a way out, but they soon realize that they are not alone in the cave.
Golden classic, also japanese versions of Ringu, Eye etc...
Loved the film, you might also enjoy Contagion which is along the same lines. One of my favorite scary movies and I don't usually care for horror is As Above so Below. Great for anyone who hates confined places.
and the Lawn Mower Man