Kalamari Outpost 4: Poljak Panic.

When a botched interrogation ignites a war between two ruthless military powers, a trio of teenage mercenaries and a legendary assassin find themselves trapped in a deadly race against time. Surrounded by 7,000 soldiers in a collapsing iron mine, they must hunt down a sadistic commander before the mountain becomes their tomb. It's a descent into a frozen wasteland where propaganda is law, and survival is a bloodbath.