SM UC-99

SM UC-99 was a German Type UC III minelaying submarine or U-boat in the German Imperial Navy during World War I.

Design

A Type UC III submarine, UC-99 had a displacement of when at the surface and while submerged. She had a length overall of, a beam of, and a draught of. The submarine was powered by two six-cylinder four-stroke diesel engines each producing , two electric motors producing, and two propeller shafts. She had a dive time of 15 seconds and was capable of operating at a depth of.
The submarine was designed for a maximum surface speed of and a submerged speed of. When submerged, she could operate for at ; when surfaced, she could travel at. UC-99 was fitted with six mine tubes, fourteen UC 200 mines, three torpedo tubes, seven torpedoes, and one 10.[5 cm SK L/45 naval gun| SK L/45] or Uk L/30 deck gun. Her complement was twenty-six crew members.

Construction and career

The U-boat was ordered on 12 January 1916 and was launched on 17 March 1918. She was commissioned into the German Imperial Navy on 20 September 1918 as SM UC-99. As with the rest of the completed UC III boats, UC-99 conducted no war patrols and sank no ships. She was surrendered to Japan on 22 November 1918. The U-boat was renamed O-5 for Japanese service from 1920 to 1921. O-5 was dismantled at the Yokosuka Navy Yard between March and June 1921. The hulk of O-5 was disposed of as a gunnery and torpedo target in October that same year.