SM UB-125 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 18 May 1918 as SM UB-125.
UB-125 was surrendered 20 November 1918 in accordance with the requirements of the Armistice with Germany. Handed over to Japan, she served as O-6 in the Imperial Japanese Navy until 1921 when she was broken up in Kure.
Construction
She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 16 April 1918. UB-125 was commissioned later the same year under the command of Kptlt. Fritz Schubert. Like all Type UB III submarines, UB-125 carried 10 torpedoes and was armed with a deck gun. UB-125 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-125 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 tonsFate29 August 1918Atxeri Mendi2,424Sunk30 August 1918Onega3,636Sunk1 September 1918Actor6,082Damaged3 September 1918Brava3,184Sunk3 September 1918Lake Owens2,308Sunk4 September 1918Bogstad1,589Sunk12 September 1918Skjold166Sunk
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