German submarine U-81 (1941)
German submarine "U-81" was a Type VIIC U-boat of the navy ("Kriegsmarine") of Nazi Germany during World War II, famous for sinking the aircraft carrier HMS "Ark Royal". Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-81" had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 6 V 40/46 four-stroke, six-cylinder supercharged diesel engines producing a total  of for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to . The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . "U-81" was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one SK C/35 naval gun, 220 rounds, and a C/30 anti -aircraft gun. The boat had a complement of between forty-four and sixty. Building and commissioning. She was ordered on 25 January 1939 and laid down on 11 May 1940 at Bremer Vulkan, Bremen-Vegesack, becoming yard number 9. She was launched on 22 February 1941 and commissioned under her first commander, "Oberleutnant zur See" ("Oblt.z.S.") Friedrich Guggenberger, on 26 April of that year. Guggenberger commanded her for her work-ups with the 1st U-boat Flotilla between 26 April and 31 July 1941. She then became a front (operational) boat of the 1st U-boat Flotilla, and set  out on a number of training patrols. Service history. Early patrols. Her first successes came on her second patrol, which took her from Trondheim into the North Sea and the North Atlantic, before putting into the French port of Brest. During the patrol she attacked Convoy SC 42. She sank the cargo ship "Empire Springbuck" on 9 September, followed by the motor ship "Sally Maersk" on 10 September, for a combined total of 8,843 GRT. "U-81" was one of the U-boats ordered into the Mediterranean. Her first attempt to break into the 'Italian Lake' almost ended in disaster, when  on 30 October she was attacked and severely damaged by a British Catalina of No. 209 Squadron RAF, as she attempted to cross the Strait of Gibraltar. The Catalina was joined by a Lockheed Hudson, which dropped depth charges onto "U-81" causing severe damage and forcing her to return to Brest. There she was repaired to return to the Mediterranean. Sinking the "Ark Royal". On 4 November "U-81" left Brest bound for La Spezia in Italy. On 13 November off Gibraltar, she encountered the inbound ships of Force H. She fired a single torpedo into the aircraft carrier , and then  avoided depth charge attacks from the escorts. Despite efforts to salvage her, the "Ark Royal" had to be abandoned 12 hours after the attack and capsized two hours later and sank. Only one man was killed, by the torpedo explosion. "U-81" reached La Spezia on 1 December, where she joined the 29th U-boat Flotilla. Patrols in the Mediterranean. Her next patrol was uneventful and resulted in no ships attacked. She sailed again on 4 April 1942 and headed into the eastern Mediterranean. On 16 April she sank the Egyptian sailing ships "Bab el Farag" and "Fatouh el Kher", as  well as the British "Caspia" and the Free French anti-submarine naval trawler . "U-81" sank a further two Egyptian sailing ships, "Hefz el Rahman" on 19 April and the "El Saadiah" on 22 April. The U-boat put into port at Salamis in Greece on 25 April, having spent 22 days at sea and sunk 7,582 GRT of shipping. A further patrol from Salamis was uneventful and she returned to La Spezia on another patrol, which saw the sinking of the British "Havre" on 10 June. "U-81"s next patrol was into the western Mediterranean. She sank the British "Garlinge" on  10 November and went on to intercept one of the convoys of Operation Torch (the invasion of French North Africa), sinking the "Maron" on 13 November. "U-81"s next patrol was uneventful and saw her briefly shift operations to Pola (now Pula, Croatia). On 25 December "Oblt.z.S." Johann-Otto Krieg took command of "U-81" from Guggenberger. She sailed from Pola on 30 January 1943 on her next patrol. On 10 February she damaged the Dutch "Saroena" and on 11 February she sank four sailing vessels, the Egyptian "Al Kasbanah" and "Sabah el Kheir", the Lebanese "Husni" and the Palestinian "Dolphin . U-81" put into Salamis on 19 February after 21 days at sea, 388 GRT of shipping sunk and 6,671 GRT damaged. Her next patrol sank three more Egyptian sailing vessels, the "Bourghieh", the "Mawahab Allah" and the "Rousdi". Her next patrol brought more substantial results, sinking the British troopship on 17 June killing 484 people, followed by the Egyptian sailing vessel "Nisr" on 25 June and the Syrian sailing vessels "Nelly" and "Toufic Allah" on 26 June. On 27 June she sank the Greek "Michalios", but was engaged by shore-based guns off Latakia. Her next patrol saw only the  Empire Moon hit on 22 July, but she was declared a total loss and spent the rest of the war under repair. The U-boat's next three patrols were uneventful but on 18 November she sank the cargo ship . Sinking. US bombers attacked "U-81" while the submarine was in Pola, at 1130hrs on 9 January 1944. She sank with two of her crew dead and 51 survivors. The wreck was raised on 22 April 1944 and broken up. She had conducted 17 patrols, sinking 26 ships totalling 42,934 GRT and 22,600 tons, damaging one other totalling 6,671 GRT and  causing one total loss totalling 7,472 GRT.