German submarine U-923

German submarine U-923 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.
She was ordered on 6 June 1941, and was laid down on 21 February 1942 at Neptun Werft AG, Rostock, as yard number 510. She was launched on 7 August 1943 and commissioned under the command of Leutnant zur See Heinz Frömmer on 4 October 1943.

Design

German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-923 had a displacement of when at the surface and while submerged. She had a total length of, a pressure hull length of, a 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 SSW GU 343/38-8 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-923 was fitted with five torpedo tubes, fourteen torpedoes or 26 TMA mines, one SK C/35 naval gun,, one Flak M42 and two twin C/30 anti-aircraft guns. The boat had a complement of between 44 — 52 men.

U-923 sunk 9 February 1945, in the Bay of Kiel in the Baltic Sea after striking a British air-laid mine. The crew of 48 were all lost.
The wreck is located at.