I think its legit. As scary as it looks the tracks are locked into the tower when the boom is reaching for the next grab and there appears to be pins that lock the plate into the tower as well. If there was a hydraulic failure, it would be pretty exciting, but unless the boom, stick or pins actually broke the excavator would likely remain attached to the pole. Not like I'd do it in a million years though
More info here
Amazing climbing excavator stunt! (Digger) I guess teh stunt was featured on a German TV show. It looks like a Liebherr machine.
Another image from a different location to confirm its not fake !!!
http://static.rp-online.de/layout/sh...19000-u-03.jpg
I wish i could find a video