The Descent directed by Neil Marshall 2005.

Can't say too much because it'll probably take a good couple of months before it's released in the US but the basic premise is a group of 6 women set off to explore some deep caves and things go horribly wrong.

The good thing is, it's a film that has several layers and therefore several interpretations, you can take it at it's most basic, a fairly decent horror flick or you can delve deeper which means re-interpreting some of the early scenes, enough said for now.

Cheers Trev.