SM UB-129 was a German Type UB III submarine or U-boat in the German Imperial Navy () during World War I. She was commissioned into the German Imperial Navy on 11 June 1918 as SM UB-129.
UB-129 was lost 31 October 1918 in Fiume () after the surrender of Austria-Hungary.
Construction
She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 11 May 1918. UB-129 was commissioned later the same year under the command of Kptlt. Karl Neumann. Like all Type UB III submarines, UB-129 carried 10 torpedoes and was armed with a deck gun. UB-129 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-129 had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate16 September 1918Buenaventura4,881Sunk22 September 1918Erik217Sunk
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