SM UC-25 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 29 August 1915 and was launched on 10 June 1916. She was commissioned into the German Imperial Navy on 28 June 1916 as SM UC-25."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In 13 patrols UC-25 was credited with sinking 21 ships, either by torpedo or by mines laid. From March to September 1918, she was commanded by Karl Dönitz, later grand admiral in charge of all U-boats in World War II. UC-25 was scuttled at Pola on 28 October 1918 on the surrender of Austria-Hungary.
Design A Type UC II submarine, UC-25 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 48 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-25 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.Fate19 October 1916Jug75Sunk6 December 1916Shchit248Sunk6 April 1917Cybele148Sunk7 April 1917Edwin R. Hunt1,132Sunk28 April 1917Juliette50Sunk15 May 1917703Sunk16 May 19175,250Damaged24 May 1917Domenico Barone171Sunk28 May 1917Nuovo S. Giovanni31Sunk28 May 1917San Domenico27Sunk31 May 1917Ninotto208Sunk1 June 1917Domenico Miscuraca194Sunk1 June 1917Vittoria248Sunk6 June 1917Mitra5,592Damaged4 July 1917HMS Aster1,250Sunk4 July 1917HMS Azalea1,250Damaged5 July 1917Eburna4,735Damaged17 October 1917HMHS Goorkha6,335Damaged18 October 1917Anna Scotto594Sunk20 October 1917Virginia Gentile164Sunk3 December 1917Melo1,115Sunk8 December 1917Chyebassa6,249Damaged23 February 1918HMT Marion255Sunk18 March 1918Massilia5,026Sunk4 April 1918Agatina201Sunk28 July 1918Vesuvio5,459Damaged29 July 1918Rio Pallaresa4,043Sunk5 August 1918Freshfield3,445Sunk
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