Heh. By what I've read of it the bugger somewhat perversely had its greatest impact simply by existing there in Norway, but did not directly manage to get about anything done. The Allies were scared to death of the bugger, full well knowing that if it managed to engage one of the Murmansk convoys they'd have very little to stop it with at hand before it sent the freighters to the bottom. One of its typically soon aborted sorties actually made one of the convoys disperse and duly get severely shredded by the Kriegsmarine and Luftwaffe bombers and subs.

It was like some sort of gravity singularity that made all the operations in the region revolve around itself, and the Allies expended considerable energy in trying to get rid of the pesky thing.