sentences:  "U-123" had a displacement of when at the surface and while submerged.The U-boat 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 MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged.