A load of climbers get stuck in a flooding cave system and get picked off one by one in Descent style minus the the suspenseful supernatural horror element. It's a bit like The Poseidon Adventure (in fact really like it in places) except not as terrifying because you're unlikely to ever find yourself in a cave other than Wookey Hole, whereas a capsized boat could happen on a jaunt to The Isle of Wight. The shouty Aussie gets on your nerves as well.
Apparently, this film is great in 3D and is produced/presented/not really involved by James Cameron. That tells you all you need to know before you even watch it.