I saw this film at the BIFFF. A film festival in Brussel, the movie felt like a ripoff of the hills have eyes and the descent. The only thing that interested me was the science behind it all. That there special species evolved before the homo sapiens came. The acting is not terrible but nothing special either. The directors were make-up artists on the film A la interieur. It showed it was there first movie, because of the feeling you get you are watching a shameless copy of the above mentioned Hollywood films. The gore in the film is also not so great, after seeing the film Matyrs i know for a fact, the french film community can make something really frightening. If i can give you an advise watch it on DVD.