A sleeper, under-rated Carpenter film.
The film follow a group of researchers tasked with investigating a mysterious swirling pool of liquid, thousands of years old, kept in secret by the church that supposedly contains Satan himself.
Part science fiction, part horror, this movie doesn't fit into easy categories. While not well received at the time, it's since become a cult classic. The film is more about character and feel than characters and acting. The truth always seems just beyond sight and understanding. Still scary at many points for this very reason.
Like many Carpenter films, there's a bit of an Un-knowable aspect to it where nothing is ever quite certain.
