The Germans built this heavy anti aircraft Battery in 1943. The six guns had a caliber of 105 mm. and were originally ship guns. They were installed in each steel dome that could rotate 360 degrees and was mounted on top of a bunker. The gun battery was built on the island of Munkholmen at the entrance to Trondheim. Trondheim was Germany's largest fleet base in Northern Europe and included two major submarine bunkers.
The guns were steered from a command bunker who was able to identify the attacking enemy bombers using a rangefinder.
The gun battery can be visited today and both one of the guns and the distance meter have been restored.