From a review website:
Outpost follows a crack team of battle-hardened mercenaries on a routine mission to protect a mysterious businessman through the no-man's land of war-torn Eastern Europe. However, after he leads them to a long forgotten, underground outpost, they unwittingly reawaken a lurking terror that soon changes their mission from one of safe-guarding, to one of survival, as they desperately battle an enemy even they've never faced before. Laced with a suffocating, claustrophobic chill that infuses every one of its terrifying set-pieces.
Empire Magazine had it down as ok but a bit contrieved. Bit of a spot the z list cannon fodder actor, (one guy from Doom I've already noticed!) Worth a look though I reckon.
(Oh yeah got my worst case scenario sample DVD through...very good!)
The Commander