SM U-89 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-89 was engaged in the naval warfare and took part in the First Battle of the Atlantic. On 12 February 1918, U-89 was rammed and sunk by off Malin Head. There were no survivors.
Design Type U 87 submarines were preceded by the shorter Type U 81 submarines. U-89 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 engines for use while surfaced, and two engines for use while submerged. She had two propeller shafts. She 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, she could operate for at ; when surfaced, she could travel at . U-89 was fitted with four torpedo tubes (two at the bow and two at the stern), ten to twelve torpedoes, one SK L/45 deck gun, and one SK L/30 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate2 October 1917Trafaria1,744Sunk3 October 1917Baron Blantyre1,844Sunk6 October 1917Victorine1,241Sunk12 December 1917Reine D'arvor324Damaged21 December 1917Boa Vista3,667Sunk
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