Although this thread seems dormant it has been most interesting reading particularly since my father was the sole survivor of LM637 LE-V shot down over the Urft Target area 8th December '44.
A few years ago I visited the area to get some background and context to the raids on the Urft. Adverts were placed in the local newspapers asking for information and we were put in touch with local historians and the water company who manage the dam gave us a guided tour of the inner passages in the dam.
According to the water company engineers, who recently have blasted further inspection galleries, it would have been impossible to destroy because the rocks used in construction were so tough, it gave them big problems in driving the extra galleries.
I have put together a storyboard with some interesting photos of the dam and nearby craters
https://www.facebook.com/media/set/?...3&l=eb5f4ee42d