Death's Head

As the war in Europe winds down, a unit of battle-fatigued GIs are tasked in liberating the survivors of the infamous Verurteilt concentration camp, in theory a relatively simple rescue mission. Upon arrival, Sergeant Rance Hawkins and his four young charges are ordered to search an unmapped area beyond the main camp for evidence of a separate, clandestine compound, reportedly created for high-ranking SS officers to further torment and torture.
Their quest will eventually lead them into a nearby coal mine, where a young camp survivor claims that her mother and other refugees are being held. Inside the murky caverns, the motley crew of dogfaces discover revelations so terrifying and vile as to make even the inhuman atrocities of Verurteilt seem tame by comparison.