Thirty years ago a group of military types accidently get trapped in a massive cavern beneath the Romanian mountains, but not before we're made sure we know that there's SOMETHING down there with them. In present day, a professor hires a diving team to explore this same vast cavern, which has finally excavated admist the ruins of an old church. One of the old frescos in the church show knights fighting demons, something which comes into play towards the end of the movie.It's estimated that there is an underground river, over eighty miles long, beneath the Carpathian Mountains, and that it has no other exit. At first the divers have no problem with anything. Soon they start discovering strange lifeforms, like this repulsive albino mole. Later, there are strange, threatening sounds. It isn't until one of the divers is killed in an avalanche that things start going wrong for them. As the leader of the group (Cole Hauser) tries to find a tunnel leading upwards, he's attached by something with large talons-and gets badly torn up. And soon the wound becomes infected, causing him to behave irrationally.Yet, he's the only one who can get all the others out alive...Although I could guess where the movie was going-and it is much more like THE RELIC than ALIENS-I was entertained and kept on the edge of my seat. The movie also has an unsettling ending which WORKS. If you missed it at the theater definitely check it out when it hits the video stores in a few months. Undeniably one of the best horror films of 2005.