more photos of underground Poland made on 27.07.2017
Riese (German for "giant") is the code name for a construction project of Nazi Germany in 1943–1945, consisting of seven underground structures located in the Owl Mountains and Książ Castle in Lower Silesia, previously Germany, now a territory of Poland.
None of them were finished; all are in different states of completion with only a small percentage of tunnels reinforced by concrete.
The purpose of the project remains uncertain because the lack of documentation. Some sources suggest that all the structures were part of the Führer Headquarters; according to others, it was a combination of headquarters (HQ) and arms industry but comparison to similar facilities can indicate that only the castle was adapted as an HQ or other official residence and the tunnels in the Owl Mountains were planned as a network of underground factories.
The construction work was done by forced labourers, prisoners of war (POWs), and prisoners of concentration camps, and many many lost their lives mostly as a result of disease and malnutrition.
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