I need help finding the name of this movie?

The movie is about 12 or so girls, and these girls like to go on adventures together. One day one of the girls is traveling by her self and finds a crevice in the middle of the woods. She goes back to her friends and they stay at a log cabin for a night then the next day they go down the crevice. As they are traveling deeper and deeper through the crevice they run into monsters who cant see, but can hear. And most of them end up dying except for one. So does anyone know the name of this movie? its not too old i think. prolly made in the 2000's.