It seems promising at first, with spelunking horrors, caves closing in, and a monster lurking in the dark. Everything went downhill from the moment the creature was discovered. if you give monsters more than 20 mins of screen time, they loss their impact. The entire film would have been by far better if they hadn't introduced the monsters or at the very least, hinted at the possibility of some creature chasing them, it was overexposure.
Overall its in entertaining film, with some incidents that don't make any sense, 6/10