SM UC-77 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 2 December 1916. She was commissioned into the German Imperial Navy on 29 December 1916 as SM UC-77."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In 13 patrols UC-77 was credited with sinking 35 ships, either by torpedo or by mines laid. UC-77 was mined and sunk off Flanders on 11 July 1918.
Design A Type UC II submarine, UC-77 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-77 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.Fate24 March 1917Grenmar1,438Sunk25 March 1917Prince of Wales158Sunk27 March 1917Galatia150Sunk27 March 1917Nova1,034Sunk27 March 1917Sandvik591Sunk28 March 1917Moulmein151Sunk28 March 1917Tizona1,021Sunk30 March 1917Petrel151Sunk26 April 1917HMT Repro230Sunk3 May 1917Glen Tanar817Sunk4 May 1917Herrington1,258Sunk4 May 1917Vale720Sunk4 May 1917Wolseley159Damaged5 May 1917Odense1,756Sunk6 May 1917Kaparika1,232Sunk3 June 1917Virgilia209Sunk6 June 1917Anton1,568Sunk6 June 1917Harald Klitgaard1,799Sunk11 July 1917Vordingborg2,155Sunk13 July 1917Ascain1,686Sunk8 August 1917Berlengas3,548Sunk11 August 1917Sonnie2,642Sunk7 September 1917Scottish Prince2,897Damaged10 September 1917Ioanna3,459Damaged15 October 1917Leander2,793Damaged19 October 1917Eldra227Sunk17 November 1917Adolph Andersen981Sunk18 November 1917Antwerpen1,637Sunk18 November 1917Gisella2,502Sunk19 November 1917Amiral Zede5,980Sunk19 November 1917Clangula1,754Sunk19 November 1917Robert Brown119Sunk30 November 1917Remoqueur N° 8250Sunk7 March 1918Cliffside4,969Damaged10 March 1918Skrymer1,476Sunk18 March 1918Baygitano3,073Sunk15 April 1918City of Winchester7,981Damaged15 April 1918Pomeranian4,241Sunk6 June 1918Huntsland2,871Sunk9 June 1918Moidart1,303Sunk10 June 1918Saint Barthelemy1,476Damaged14 June 1918HMT Princess Olga245Sunk
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