Eighty Years in the Center of the Earth: Shadow of the Last Fortress

In 1945, the Third Reich was on the verge of collapse. An elite regiment that refused to surrender took the ultimate legacy of the empire and escaped into the "Nibelungen", an underground fortress 800 meters deep in the Alps. Survival materials that have lasted for eighty years are stocked here, and the self-circulation system is complete, making it seem like an isolated steel kingdom.