I did a search for this film, and couldn't find one, so here we are!
I watched it over the weekend. Part 2 is released in July, apparently.
Very interesting premise. It's a horror/thriller, where the characters have to stay quiet, or they will be hunted. I like it. Very tense in parts. Worth a watch.
Anyone excited about the second one? I don't know the full story, but it will explain some of the background to the original film.