SM UC-75 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 12 January 1916 and was launched on 6 November 1916. She was commissioned into the German Imperial Navy on 6 December 1916 as SM UC-75."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In 13 patrols UC-75 was credited with sinking 59 ships, either by torpedo or by mines laid. UC-75 rammed and sunk by on 31 May 1918 with 17 dead and 14 survivors. HMS Fairy had sustained heavy damage and sank a short time later.
Design A Type UC II submarine, UC-75 had a displacement of when at the surface and while submerged. She had a length overall of , a beam of , and a draught of . The submarine was powered by two six-cylinder four-stroke diesel engines each producing (a total of ), two electric motors producing , and two propeller shafts. She had a dive time of 30 seconds and was capable of operating at a depth of .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-75 was fitted with six mine tubes, eighteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one Uk L/30 deck gun. Her complement was twenty-six crew members.
Summary of raiding history DateNameNationalityTonnageMerchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.Fate25 March 1917Industria133Sunk25 March 1917Marshall1,123Sunk25 March 1917Median214Sunk25 March 1917Rosslyn113Sunk28 March 1917Expedient145Sunk29 March 1917Schaldis1,241Sunk1 May 1917Alide175Sunk3 May 1917Carberry King31Sunk3 May 1917Eleanor31Sunk3 May 1917Fastnet31Sunk3 May 1917Hibernia21Sunk3 May 1917Lucky Lass10Sunk3 May 1917North Star15Sunk3 May 1917Sir Edward Birkbeck23Sunk4 May 1917Marie133Sunk5 May 1917HMS Lavender1,200Sunk6 May 1917President354Sunk15 May 1917Polymnia2,426Sunk7 June 1917Wilhelm187Sunk11 June 1917Anglian5,532Sunk12 June 1917HMS Prize199Damaged18 June 1917Kathlamba6,382Damaged19 June 1917Kelso1,292Sunk20 June 1917Benita130Sunk20 June 1917Bidartaise123Sunk29 July 1917Saint Marcouf1,117Sunk1 August 1917Karina4,222Sunk3 August 1917Beechpark4,763Sunk3 August 1917HMS Mary B. Mitchell227Damaged25 August 1917Cymrian1,014Sunk29 August 1917Cooroy2,470Sunk29 August 1917Lynburn587Sunk28 September 1917William Middleton2,543Damaged9 October 1917Main715Sunk12 October 1917W. M. Barkley569Sunk13 October 19172,293Sunk19 October 1917Hazelwood3,120Sunk3 November 1917HMD Deliverer79Sunk3 November 1917Atlantian9,399Damaged4 November 1917Longwy2,315Sunk8 November 1917The Marquis373Sunk1 December 1917Euphorbia3,109Sunk1 December 1917Rydal Hall3,314Sunk4 December 1917Milton3,267Damaged7 December 1917Earl Of Elgin4,448Sunk28 December 1917Alfred H. Read457Sunk28 December 1917Chirripo4,050Sunk3 January 1918Asborg2,750Sunk4 January 1918Day Spring39Sunk4 January 1918Gratitude40Sunk4 January 1918Varuna40Sunk5 January 1918Iolanthe3,081Sunk6 January 1918Arca4,839Damaged7 January 1918Gascony3,133Sunk7 January 1918Leon2,401Sunk5 March 1918Edouard Marie32Sunk9 March 1918Marguerite10Sunk10 March 1918Sunrise56Sunk10 March 1918Wave47Sunk13 March 1918Arno Mendi2,827Sunk14 March 1918Tweed1,777Sunk17 March 1918Eliza Anne36Sunk18 March 1918Navigator3,803Damaged28 March 1918Dryden5,839Damaged16 April 1918Hungerford5,811Sunk19 April 1918War Helmet8,184Sunk12 May 1918Benlawers3,949Damaged29 May 1918HMT Dirk181Sunk31 May 1918355Sunk
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