When was the the ship launched ,that along with the Tripitz and the Lützow was a target for  Operation Source ?
Operation Source Operation Source was a series of attacks to neutralise the heavy German warships – "Tirpitz", "Scharnhorst" and "Lützow" – based in northern Norway, using X-class midget submarines.
German submarine U-35 (1936) German submarine "U-35" was a Type VIIA U-boat of Nazi Germany's "Kriegsmarine". She was built three years before the start of World War II. The submarine was laid down on 2 March 1936 by Friedrich Krupp Germaniawerft at Kiel, launched on 24 September 1936, and commissioned on 3 November that year under the command of "Kapitänleutnant" ("Kptlt.") Klaus Ewerth. The U-boat was featured on the cover of "Life" magazine on 16 October 1939, as in the days preceding, it "courteously" rescued all the sailors of a Greek ship that it was about to sink.