Plan of the tunnel system in Hersbruck, March 1945, Federal Archives Berlin<br />Bundesarchiv Berlin<br /><br />In early 1945, the mountain tunnels project was reduced to about a third of the original plan. By the end of the war only one tunnel facility was erected, whose size was about 14,000 square meters and four kilometers long in total (highlighted in color on the map).
Plan of the tunnel system in Hersbruck, March 1945, Federal Archives Berlin

In 1944-1945 the Nazi leadership tried to shift the arms industry undergrounds, and thus to protect it against bomb attacks, in numerous large-scale projects. One of these projects was created in Happurg. Prisoners of the Flossenbürg subcamp Hersbruck had to dig, from July 1944, a system of tunnels in the sandstone of the Houbirg mountain side. A tunnel system of 200,000 square meters was planned for the production of BMW aircraft engines. Hochtief AG, Siemens Bauunion, AEG and other well-known German companies were involved in this project.

Up to 2,500 concentration camp inmates worked under miserable conditions in the mountain and in front of the tunnel entrances, working at laying railway lines or at building constructions. Because of accidents, exhaustion and the violence of the Kapos or SS, prisoners died every day. The project failed: arms production there has never occurred.

The tunnel system is in dire danger today of collapsing and is inaccessible.

Interior of the tunnel system, 2005<br /><br />Only a part of the construction was ever covered in concrete. The non-secured areas are in risk of collapsing.
Interior of the tunnel system, 2005
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