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How to tear down a large building? The task is the same as drilling a tunnel, but from the top to the bottom, between other skyscapers and at unlimited traffic. Crushing-robots, equipped with cuttingtorches and pneumatic-hammers are positioned in a way, that the swivelling ranges of their arms overlap the whole floor area. In cooperation, they remove one floor after another. Through ducts, hanging outside the building, the debris transported down to the ground, where it is shredded and sorted.