Panta Oz’s review published on Letterboxd:
This was a very good horror... and I am glad I got the UK version which has completely different ending from the US one! So, you get that one, too, you will not regret!
The story of a group of friends starts with tragic events then moves to reunion few years later. Women decide to explore cave system but suddenly discover a whole trail of mysterious animal carcasses. So, from there on, the cave exploration goes horribly wrong. It's not just that they have no clue how to get out... they discover that they are not alone and soon enough they are being hunted.
Directing of Neil Marshall was something exceptional - he masterfully orchestrates the mood and tension and never evolves into a trite action movie.
Scary... and that is the best part!