SM U-123 was a German Type UE II submarine that served prominently during World War I as part of the Imperial German Navy. With a total length of 82 meters (269 feet) and a beam of 7.42 meters (24 feet 4 inches), U-123 was designed for both patrol and offensive operations in the Atlantic theater. Her displacement was 1,163 tonnes (1,145 long tons) on the surface and increased to 1,468 tonnes (1,445 long tons) when submerged, reflecting her capacity for underwater operations. Powered by two 2,400 metric horsepower (1,800 kW) engines for surface travel and two 1,235 metric horsepower (908 kW) engines for submerged propulsion, U-123 could reach a maximum surface speed of 14.7 knots and a submerged speed of 7.2 knots. Her operational depth was up to 75 meters (246 feet), allowing her to evade enemy threats and conduct stealthy attacks. The submarine was equipped with two shafts and twin 1.61-meter (5.3-foot) propellers, facilitating her maneuverability. U-123's armament included four 50-centimeter (20-inch) torpedo tubes at the bow, armed with a total of twelve torpedoes. She also featured two 100-centimeter (39-inch) mine chutes at the stern, capable of deploying forty-two mines, enhancing her offensive and defensive capabilities. Surface weaponry comprised two 15-centimeter (5.9-inch) SK L/45 deck guns with 600 rounds, suitable for engaging smaller vessels and shore targets. Her operational range was substantial; when surfaced, she could travel approximately 11,470 nautical miles (21,240 km) at an economical 8 knots, enabling extended patrols across the Atlantic. U-123's complement consisted of thirty-six crew members and four officers, reflecting her role as a formidable and versatile submarine in the German naval fleet. U-123 participated actively in naval warfare, notably taking part in the First Battle of the Atlantic. Following Germany's defeat, she was surrendered to the Allies at Harwich on 22 November 1918, in accordance with the armistice terms. Initially intended for experimental use, she was laid up at Portsmouth before being towed into the English Channel, where she was scuttled on 28 June 1921. Her service and subsequent disposal mark her as a notable vessel in the history of WWI submarine warfare.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.