Outpost

In war-torn Eastern Europe, a mysterious businessman hires a group of mercenaries on a routine mission to protect him not knowing of the long-hidden secret that lies there.

Outpost is a 2008 horror sci-fi movie directed by Steve Barker, starring Richard Brake, Ray Stevenson, Julian Wadham. It holds an IMDb rating of 5.8/10 from 18,608 votes and runs 1h 30m.