SM U-125

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

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, twelve torpedoes, two mine chutes, forty-two mines, one SK L/45 deck gun, and 494 rounds. She had a complement of forty.

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 formerO-1 was recommissioned as Auxiliary Vessel No. 2900 and used as such until 1935.