 They are more than a kilometer from the west wing combat blocks and close to two kilometers from the east wing blocks, at a depth underground of approximately .The western underground barracks and the large "M1"-type magazine are just inside the entries.These areas were converted and expanded to form the basis of "Base Aérienne 901 Drachenbronn" in a manner similar to the adaptation of Ouvrage Rochonvillers for the NATO CENTAG headquarters of the 1960s.