German submarine U-135 (1941)
German submarine "U-135" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. She was laid down at the "Vulkan-Vegesackerwerft" in Bremen on 16 September 1940 as yard number 14, launched on 12 June 1941 and commissioned on 16 August with "Oberleutnant zur See" Friederich-Hermann Praetorius in command. "U-135" began her service career in training with the 5th U-boat Flotilla, before moving on to the 7th flotilla for operations. Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-135" 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-135" 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. Service history. The boat sank three ships totalling and damaged a fourth of . First and second patrols. The submarine's first patrol began with her departure from Kiel on 24 December 1941. Her route took her across the North  Sea and into the Atlantic Ocean via the passage between the Orkney and Shetland Islands. As part of wolfpack 'Ziethen', she sank "Gandia" on 22 January 1942 east of Cape Race, (Newfoundland). She arrived at St. Nazaire in occupied France on the 31st. Her second foray was northeast of Iceland, but she returned to another port, Brest, on 3 April 1942. Third and fourth patrols. Her third sortie was her longest, at 71 days. Having departed Brest on 26 April 1942, she sank "Fort Qu Appelle" on 17 May north of Bermuda. She also sank "Pleasantville" on 8 June northwest  of Bermuda before returning to St. Nazaire on 5 June. "U-135" discovered and shadowed convoy ON 122 during her fourth patrol, and was able to remain on patrol following heavy damage received when attacked with depth charges and Hedgehog by HNoMS "Potentilla" and . The boat was later attacked by a Czech-crewed Vickers Wellington aircraft of No. 311 Squadron RAF on 3 October 1942 in the Bay of Biscay. Only minor damage was sustained, but one man was killed and another died of his wounds. Fifth and sixth patrols. Her fifth sortie took her across the Atlantic, almost to the  coast of Newfoundland. "U-135"s sixth patrol was toward Greenland; she was attacked by a British B-24 Liberator of 120 Squadron northeast of Ireland on 8 February 1943. Some damage was repaired, but the boat was forced to return to Lorient on 10 March when further leaks were discovered. Seventh patrol and loss. For her last patrol, she left Lorient on 7 June 1943. Northeast of the West Indies, she attacked and damaged "Twickenham" on the 15th. She then moved to the east Atlantic where she was attacked by the sloop , the corvettes and and a US PBY Catalina flying boat  of VP-92. "U-135" was sunk east of the Canary Islands on 15 July. Five men died, there were 41 survivors. Wolfpacks. "U-135" took part in ten wolfpacks, namely: