First thing first... Turn OFF the lights, put your headphones on and send everyone from the room away and ONLY then ... click PLAY!
I can tell your right now, that if you are fan of all mentioned movies, you will most probably like this one too. There is everything you would expect from "real" horror movie.
I was tensed when I was watching & I can say it is interesting and probably the most realistic of all similar movies. Not because of the quality of the movie, but because of this can REALLY be true. Don't take me wrong, I am not saying that I actually believe in this, but it is more likely to happen than all of the "predecessors"
I don't want to and I will not spoil you experience from the movie, so I will not tell you what is really going on or what will they discover down there, but I will say, that you will be scared. If I would imagine myself in situation like that ... oh my god!
The movie has great scene and it has stupid moments. As the title suggest, there will be dark. Every good movie shows just a glimpse, this one is not different. Maze underground, only feint of light, creepy sounds, strange movements, loud breathing and ...
You will see... but I can recommend this movie if you are a horror fan. I was expecting less from this one. Despite the fact, that there are some elements, like "randomly" places cameras on the ground, always shooting the important thing or running and screaming and still shooting the right direction and things like these, pretty decent movie.
There is only one thing from holding me give more points ...When I first saw Blair Witch I was thrilled and really scared! Most of all I BELIEVED in what I have seen that time, I BELIEVED that I was watching a "REAL FOOTAGE". After couple of months I have found out, that it was a fake and nothing of it happened. This time I don't believe... maybe it is based of true story maybe not, I don't know and I don't care. Couple of years ago it would be 9/10.
The most important thing for me in this case is ... Really good movie! To believe or not, it is purely up to YOU!