SM UC-46 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 20 November 1915, laid down on 1 February 1916, and was launched on 8 August 1916. She was commissioned into the German Imperial Navy on 15 September 1916 as SM UC-46."SM" stands for "Seiner Majestät" () and combined with the U for Unterseeboot would be translated as His Majesty's Submarine. In four patrols UC-46 was credited with sinking 10 ships, either by torpedo or by mines laid. UC-46 was rammed and sunk southeast of Goodwin Sands by the British destroyer on 8 February 1917.
Design A Type UC II submarine, UC-46 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-46 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.Fate21 December 1916Modig1,704Sunk23 December 1916William Middleton2,543Damaged24 December 1916Paul Paix4,196Damaged26 December 1916Agnes99Sunk26 December 1916Neptune199Sunk26 December 1916Saint Louis184Sunk30 December 1916Sappho2,087Sunk1 January 1917Goosebridge1,886Sunk1 February 1917Gamma2,115Sunk2 February 1917Isle of Arran1,918Sunk4 February 1917Marthe154Sunk5 February 191712,097Damaged6 February 1917HMT Longset275Sunk
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