This guy crash land on top of this cliff (not sure if he went back in time or it’s an alternative universe) anyway he discovers this village hanging from the actual cliff face like on the side and he befriends this lady and her daughter, he notices there are no elderly people in the village. They go down to the ground to collect water and stuff and then all of a sudden this big green creatures pop out from under the ground and start pulling people under, hence the no old people. The daughter is taken and the guy ends up going down the whole into where the creatures live to try and find the girl.