The Bunker (2001)

Set in 1944 along the Belgian-German border, a group of seven German soldiers takes refuge in a bunker after surviving an American assault. Trapped and low on ammunition, they turn to a network of underground tunnels in hopes of discovering supplies and a way out. As they delve deeper into the dark passages, unsettling occurrences begin to unfold among them, testing their sanity and camaraderie in the face of impending doom.