During World War II, the Germans found the wide and fairly deep Bogen bay, with its mostly hard rock bottom well suited for anchoring, to be perfect for a naval base. Narvik is only to the east (further into the fjord). The German battleship "Tirpitz" and cruiser "Admiral Hipper" were stationed in Bogen during part of the war (8 July – 23 October 1942, returned 11 March 1943). The battleships "Scharnhorst" and "Lützow" were based in Bogen for a shorter time. Additionally, several destroyers and submarines used Bogen as a base for shorter periods. Thus, this bay was one of Germany's most powerful naval bases during parts of the war and constituted a very real threat to Allied Arctic Convoys. The Allies had an obvious need for intelligence about these powerful German warships, and the British provided a radio set to the local resistance group. This radio was set up at Liland, 9 km west of Bogen, and codenamed "Lyra".