Secrets lay burried under Fliegerhorst Kaserne (fliegerhorst Langendiebach) Near Hanau

I posted this several years ago on this website, but didn't get much of a response. I have been looking for info on Fliegerhorst Kaserne (Fliegerhorst Langendiebach- an old Luftwaffe airfield near Hanau, Germany now used by the US Army). There are apparently some underground bunkers there under the airfield which, now filled with water, at one time housed aircraft I spoke with a gentleman who had actually been in a sealed room near the old steam plant (accessed from there) & said there were rusty helmets, etc. in there & that CMD threatened them with UCMJ for trespassers. Tunnel entrances in wall of steam plant basement were later bricked over. My BN CDR also said there was a bricked-over entrance to a tunnel in the basement of his quarters on Fliegerhorst. There is a printed local history in the U.S. forces library in Hanau, which states that in1979, a 2-1/2 ton truck fell through the street and uncovered a network of tunnels, equipment for pumping water on and off the airfield for concealment, and 3 underground bunkers on the airfield which contained aircraft parts and a lot of water. I used to be stationed there in the late 90s & found some "Suspicious areas", but nothing definitive. Can anyone provide info on this? soldier20@hotmail.com