What one can find "under" Berlin, is while more often of the gruesome nature, indeed fascinating. I am not certain and have my hesitations in believing "whole, intact" fighters are buried, it is not out of the realm of possibility.
I can tell you this for sure. Zeagle2, a squad mate of mine, who lives in south florida, recently returned from a trip to the White 1 works hanger, where a couple of FW190 F-8's are being restored. In that hanger, are two recently aquired Junker Yumo inline engines belonging to the FW190 D series fighter. These engines were indeed found (in remarkably good condition) during a recent construction dig at the Berlin Airport.
Pictures of the 190's, the engines, and other authentic LW relics can be found on our Squad website, as well as links to the White 1 and other current LW restoration projects. Please feel free to explore if intersted.
http://www.blackcrosses.orghttp://www.blackcrosses.org/