SM U-87
Introduction '''SM ''U-87''''' was one of the 329 submarines serving in the Imperial German Navy (''Kaiserliche Marine'') in World War I. ''U-87'' was engaged in the naval warfare and took part in the First Battle of the Atlantic. She sank some 22 merchant vessels before 25 December 1917, when  rammed ''U-87'' in the Irish Sea and depth-charged her. Then the P-class sloop ''P.56'' sank her. ''U-87''s entire crew of 44 were lost.
Design German Type U 87 submarines were preceded by the shorter Type U 81 submarines. The first of its type, ''U-87'' 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-87'' 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 DateNameNationalityTonnageFate23 May 1917''Bernisse''951Damaged23 May 1917''Elve''962Sunk26 May 1917''Lucipara''1,943Sunk26 May 1917''Saint Mirren''1,956Sunk30 May 1917''Bathurst''2,821Sunk30 May 1917''Hanley''3,331Sunk2 June 1917''Eliofilo''3,583Sunk2 June 1917''Mississippi''6,687Damaged4 July 1917''Loch Katrine''151Sunk8 July 1917''Valetta''5,871Sunk10 July 1917''Seang Choon''5,807Sunk11 July 1917''Kioto''6,182Sunk12 July 1917''Castleton''2,395Sunk16 July 1917''Tamele''3,932Sunk19 July 1917''Artensis''1,788Sunk21 July 1917''Coniston Water''3,738Sunk19 August 1917''Eika II''1,268Sunk21 August 19172,296Sunk22 August 1917''Alexander Shukoff''1,652Sunk27 August 1917''Anna''1,211Sunk27 August 1917''Aurora''768Sunk13 December 1917''Little Gem''114Sunk24 December 1917''Daybreak''3,238Sunk25 December 1917''Agberi''4,821Sunk
Fate and discovery In August 2017, researchers from Bangor University in Wales announced they had discovered the sunken wreck of U-87 while conducting multibeam surveys 10 miles northwest of Bardsey Island as part of the marine renewable energy SEACAMS 2 project. Detailed sonar images reveal the wreck to be lying in one piece with what appears to be a large area of damage near the conning tower, presumably caused by in the ramming collision by escort P.56.
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