World War 2 Nazi Fortress Ny-Hellesund

Norway / Vest-Agder / Hollen /
 Second World War 1939-1945, military
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Old subterrain fortress from second world war. about 5-6 gun positions visible, anti aircraft and big guns to protect nazi occupied norway from sea attacks. Located in Ny-Hellesund, Søgne
Source
www.wartourist.eu/PDF/Ny-Hellesund.pdf
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Wikipedia article: https://en.wikipedia.org/wiki/Atlantic_Wall
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Coordinates:   58°2'59"N   7°50'55"E