This was also a facility of the U. S. Army Berlin-Brigade.

In Grunewald, southwest of the Olympiastadium startet in 1937 the construction site of Wehrtechnischen Fakultaet.

The ground and first floor were strcuturally almost completet as the second World War begun.
After the war, the ruins were covered by debris of the destroied buildings of Berlin.

The Teufelsberg has now a height of 114 meters above sea level.

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The US National Security Agency (NSA) built one of its largest listening stations on top of the hill, rumoured to be part of the global ECHELON intelligence gathering network.

The hill was located in the British sector.

Mobile Allied listening units would drive to different locales in West Berlin hoping to gain the best vantage point for listening to Soviet and East German military traffic.

One such unit drove to the top of Teufelsberg and discovered a marked improvement in listening ability. This discovery eventually led to a large structure being built atop the hill, which would come to be run by the NSA. At the request of US government, the ski lifts were removed because they allegedly disturbed the signals.

The station continued to operate until the fall of East Germany and the Berlin Wall, but after that the station was closed and the equipment removed. The buildings and radar domes still remain in place.

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