National Geographic with cleaner video of one of the cranes coming down. Note that it strikes the crane on the grounds jib as well! Watch that this work and survive. Now consider that this crane also lost it's counterweights. I would have never guessed that it would survive the shock and loss of counterweights. The jobsite was struck by a 6.8 magnitude earthquake while building Taipei 101. The cranes appear to be Favelle Favco's and I will assume that they were being bottom climbed menaing that they were supported by the concrete floors below and wedged in them. During the earthquaked the floor are trying to keep them selves together. Add on 500,000 lbs of crane and a failure is likely. These cranes were up to the 56th flioor. Given the carnage, we are lucky that only five people died.
Video showing both cranes coming down, in poor quality from two angles.