Bruce Hunt's horror film, set in Romania, begins with a prologue in which a group of treasure hunters break into a blocked cave beneath a church. They become entombed and discover the terrible truth of why the cave was sealed centuries before... Thirty years later, a team led by cave diver Jack, his brother Tyler and scientist Nicolai force their way in to the same cave and descend into a labyrinth of passages and rivers in the search for species unknown to man. But waiting in the dark is a species that feasts on human flesh.