SM U-125
Introduction Japanese submarine Maru-1 in 1919'''SM ''U-125''''' was one of the 329 submarines serving in the Imperial German Navy in World War I. ''U-125'' was engaged in the naval warfare and took part in the First Battle of the Atlantic.
Design German Type UE II submarines were preceded by the shorter Type UE I submarines. ''U-125'' had a displacement of  when at the surface and  while submerged. She had a total 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 shafts and two  propellers. 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-125'' was fitted with four  torpedo tubes (fitted at its bow), twelve torpedoes, two  mine chutes (fitted at its stern), forty-two mines, one  SK L/45 deck gun, and 494 rounds. She had a complement of forty (thirty-six crew members and four officers).
Service === Germany ====== Post-war ===''U-125'' was surrendered to Japan on 26 November 1918 and was renamed ''O-1'' in 1920 or 1921.She was dismantled at the Yokosuka Naval Arsenal between January and March 1921.Between March 1924 and January 1925, she was used as a floating jetty at the Kure KSubmarine School. In 1925, she was rebuilt at Yokosuka as testbed for submarine salvage operations carried out by the submarine tender . On 19 August 1931, the former''O-1'' was recommissioned as ''Auxiliary Vessel No. 2900'' and used as such until 1935.
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