SM ''U-125'') and combined with the ''U'' for ''Unterseeboot'' would be translated as ''His Majesty's Submarine''., group=Note was one of the 329

submarine A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely op ...

s serving in the

Imperial German Navy The Imperial German Navy or the Imperial Navy () was the navy of the German Empire, which existed between 1871 and 1919. It grew out of the small Prussian Navy (from 1867 the North German Federal Navy), which was mainly for coast defence. Wilhel ...

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

. ''U-125'' was engaged in the

naval warfare Naval warfare is combat in and on the sea, the ocean, or any other battlespace involving a major body of water such as a large lake or wide river. Mankind has fought battles on the sea for more than 3,000 years. Even in the interior of large la ...

and took part in the

First Battle of the Atlantic The Atlantic U-boat campaign of World War I (sometimes called the "First Battle of the Atlantic", in reference to the World War II campaign of that name) was the prolonged naval conflict between German submarines and the Allied navies in Atla ...

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 Beam may refer to: Streams of particles or energy *Light beam, or beam of light, a directional projection of light energy **Laser beam *Particle beam, a stream of charged or neutral particles **Charged particle beam, a spatially localized grou ...

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 tube A torpedo tube is a cylindrical device for launching torpedoes. There are two main types of torpedo tube: underwater tubes fitted to submarines and some surface ships, and deck-mounted units (also referred to as torpedo launchers) installed aboa ...

s (fitted at its bow), twelve

torpedo A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, and with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, su ...

es, 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 A jetty is a structure that projects from land out into water. A jetty may serve as a breakwater, as a walkway, or both; or, in pairs, as a means of constricting a channel. The term derives from the French word ', "thrown", signifying somet ...

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.

References

Notes

Citations

Bibliography

* {{DEFAULTSORT:U0125 World War I submarines of Germany 1918 ships Ships built in Hamburg U-boats commissioned in 1918 Foreign submarines of the Imperial Japanese Navy German Type UE II submarines