German submarine U-999 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II.
She was ordered on 14 October 1941, and was laid down on 19 December 1942, at Blohm & Voss, Hamburg, as yard number 199. She was launched on 17 September 1943, and commissioned under the command of Oberleutnant zur See Hermann Hansen on 21 October 1943.
Design German Type VIIC/41 submarines were preceded by the heavier Type VIIC submarines. U-999 had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , an overall beam of , a height of , and a draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two BBC GG UB 720/8 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat 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, the boat could operate for at ; when surfaced, she could travel at . U-999 was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one SK C/35 naval gun, (220 rounds), one Flak M42 and two C/30 anti-aircraft guns. The boat had a complement of between forty-four and fifty-two.
Service history U-999 was scuttled in Flensburg Fjord on 5 May 1945, after participating in only one war patrol that yielded no ships sunk or damaged. The wreck was recovered and broken up in 1948.
See also Battle of the Atlantic
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