Stock Photo - Polish geologist Leopold Stempowski opens the entrance door to a tunnel under the former Schloss Fuerstenstein (Ksiaz castle) in the Polish city Walbrzych, Poland, 03 September 2015. The tunnel is used for research purposes by the geophysical institute of the Polish Academy of Sciences. The tunnel system has a total length of approximately two kilometers and had been secretly build by concentration camp prisoners. It was supposed to be used as command center for high SS and armed forces leaders. Photo: Arno Burgi | usage worldwide. - Walbrzych/Poland

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