SM U-123

SM U-123 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-123 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

U-123 was surrendered to the Allies at Harwich on 22 November 1918 in accordance with the requirements of the Armistice with Germany. Initially earmarked for experiments, she was laid up at Portsmouth until towed out into the middle of the English Channel and scuttled on 28 June 1921.

Design
Type UE II submarines were preceded by the shorter Type UE I submarines. U-123 had a displacement of 1163 t when at the surface and 1468 t while submerged. She had a total length of 82 m, a beam of 7.42 m, a height of 10.16 m, and a draught of 4.22 m. The submarine was powered by two 2400 PS engines for use while surfaced, and two 1235 PS engines for use while submerged. She had two shafts and two 1.61 m propellers. She was capable of operating at depths of up to 75 m.

The submarine had a maximum surface speed of 14.7 kn and a maximum submerged speed of 7.2 kn. When submerged, she could operate for 35 nmi at 4.5 kn; when surfaced, she could travel 11470 nmi at 8 kn. U-123 was fitted with four 50 cm torpedo tubes (fitted at the bow), twelve torpedoes, two 100 cm mine chutes (fitted at the stern), forty-two mines, two 15 cm SK L/45 deck guns, and 600 rounds. She had a complement of forty (thirty-six crew members and four officers).