Tubize France, A Tower Crane lost one of it's counterweights while operating. The weight crashed through a school that the weight was suspended over going through the roof, through the floor and into what appears to be a parking structure. One counterweight remained attached. The combination of the trolley being all of the way in and apparently no load being on the hook and the weight remaining attached may have been the difference between collapse and remaining standing. Had the second weight dropped off suddenly I have a hard time believing the crane would stand. On the other hand, it's certainly happened a number of times where one jib of the other has collapsed and the crane remained vertical. If you've ever been on a crane while being erected or dismantled, you'd no doubt be with me and not understand how that can be. Link to original story with more pictures.
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