the ship had her steam turbines overhauled at the Blohm & Voss shipyard; a degaussing coil was fitted to the ship's hull during this overhaul. By March, the ship was again fully operational. Deployment to Norway On 19 March 1942, Admiral Hipper steamed to Trondheim, escorted by the destroyers , , and and the torpedo boats , , and . Several British submarines were patrolling the area, but failed to intercept the German flotilla. Admiral Hipper and her escorts reached their destination on 21 March. There, they joined the heavy cruisers Lützow and , though the latter soon returned to Germany for repairs after being torpedoed. On 3 July, Admiral Hipper joined the cruisers Lützow and and the battleship for Operation Rösselsprung, an attack on convoy PQ 17. Escorting the convoy were the battleships and and the aircraft carrier . Admiral Hipper, Tirpitz, and six destroyers sortied from Trondheim, while a second task force consisting of Lützow, Admiral Scheer, and six destroyers operated out of Narvik. Lützow and three of the destroyers struck uncharted rocks while en route to the rendezvous and had to return to port. Swedish intelligence had meanwhile reported the German departures to the British Admiralty, which ordered the convoy to disperse. Aware that they had been detected, the Germans aborted the operation and turned over the attack to U-boats and the Luftwaffe. The scattered vessels could no longer be protected by the convoy escorts, and the Germans sank 21 of the 34 isolated transports. When the Admiral Hipper moved together with the Admiral Scheer and the light cruiser to the Altafjord on 10 September in preparation for Operation Doppelschlag, the ships were unsuccessfully attacked by the British submarine . This operation was also aborted, because Hitler did not want to risk losses to the surface fleet. In Operation Zarin, the cruiser laid a minefield on 24–28 September off the north-west coast of Novaya Zemlya, escorted by the destroyers , , , and Z30 The goal of the operation was to funnel merchant traffic further south, closer to the reach of German naval units in Norway. After her return to port, Admiral Hipper was transferred to Bogen Bay near Narvik for repairs to her propulsion system. On 28–29 October, Admiral Hipper and the destroyers Friedrich Eckoldt and Richard Beitzen were transferred further north from Narvik to the Altafjord. Starting on 5 November, Admiral Hipper and the 5th