Hi,
I'm the airfield historian of Coleman Army Airfield at mannheim, Germany.
It is so interresting that you mention those rumors because it seems that those underground hangars etc have been supposely at every Luftwaffe airfield. Also at mine I heard those. Mostly it is only a rumor and nothing else, think of it - fooding the runway is not easy. Where should the water go it wont stay up there and those undergound areas with aircraft - I was searching for those too but after asking old eyewitnesses it was clear it is only a rumor. It made it more interresting for the intellegince agencys to find the Nazi gold. Even here at Sandhofen the CIA spend several millions of $ to search for it.
But on the other hand, the is always a spark of truth in any rumor.
They are expanding Ansbach Airfield at this time and we will have a meeting there soon. I will ask the other ATC Controllers if they know anything more.
Hope I couls help
Dirk
3/58th AVN
www.fliegerhorst-sandhofen-coleman.de