radar detector on this trip. On 1 October 1944 the U-boat was transferred to the 33rd U-boat Flotilla. She carried out only one additional patrol in the Indian Ocean, in 1944–1945, on their journey home with 130 tons of tin, 20 tons of molybdenum, 80-100 tons of raw rubber, and the latest radar-detection equipment FUMB26 TUNIS. They ended up sinking a single ship of 10,198 GRT. Because of their cargo, they only had room for two torpedoes, which they used in this sinking. The trip home was aborted when the main bearings started to wear out, prompting a return to Batavia on 6 January 1945, but transferring their fuel to near the Cocos Islands on the way. On the 12th, they were ordered to Penang, but only made it as far as Singapore. There they worked on repairing the engines and fitting a Schnorchel, before attempting a renewed trip home starting on 10 May. Wolfpacks U-181 took part in one wolfpack from 27 to 30 March 1943. Fate On 6 May, Otto Giese dropped the two code-key machines into the Singapore harbor, and later that day, the boat was "taken" by the Japanese Captain Marujama. Admiral Paul Wenneker sent the message on 8 May, that Lubeck was in place, "an early agreement between Germany and Japan, if one nation lost and the other continued fighting, the former would render its war material to the latter." The crew was taken to Batu Pahat. After Germany's surrender in May 1945 the U-boat was taken over by Japan at Singapore and commissioned as I-501 on 15 July 1945. She surrendered to Allied forces there in August 1945, and was sunk on 12 February 1946 in the Strait of Malacca, in position , by the British frigates and . Summary of raiding history References Bibliography External links Submarine I-501: Tabular Record of Movement German Type IX submarines World War II submarines of Germany World War II submarines of Japan Foreign submarines of the Imperial Japanese Navy U-boats commissioned in 1942 Indian Ocean U-Boats 1941 ships U-boats sunk by British warships U-boats scuttled in 1946 Maritime incidents in 1946 Ships built in Bremen (state) Shipwrecks in the Strait of Malacca