SM UB-129

SM UB-129 was a German Type UB III submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) 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 (45.31667°N, 14.43333°W) 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. Like all Type UB III submarines, UB-129 carried 10 torpedoes and was armed with a 10.5 cm deck gun. UB-129 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7280 nmi. UB-129 had a displacement of 512 t while surfaced and 643 t when submerged. Her engines enabled her to travel at 13.9 kn when surfaced and 7.6 kn when submerged.