Reading post 615926 in main thread: Underground plant in Porta-Westfalica
January 8th, 2012  
I had a quick look around and found a couple of photo's that are reasonably common on the internet so I assume you already have those, I also tripped over a German website that seemed to focus on the various bunkers and underground installations of WW2 and they mentioned those facilities but I did not sign up to the forum so my access was limited.

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