Postwar photo of Hecht (S 171), (former Type XXIII submarine U-2367). An identical sister ship of U-4703.
|Ordered||7 July 1944|
|Builder||Friedrich Krupp Germaniawerft AG, Kiel|
|Laid down||1 November 1944|
|Launched||3 January 1945|
|Commissioned||21 January 1945|
|Fate||Scuttled on 5 May 1945|
|General characteristics (XXIII)|
|Draught||3.66 m (12 ft)|
|Test depth||180 m (590 ft)|
German submarine U-4703 was a Type XXIII U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 7 July 1944, and was laid down on 1 November 1944 at Friedrich Krupp Germaniawerft AG, Kiel, as yard number 945. She was launched on 3 January 1945 and commissioned under the command of Oberleutnant zur See Hans-Ulrich Scholz on 21 January 1945.
Like all Type XXIII U-boats, U-4703 had a displacement of 234 tonnes (230 long tons) when at the surface and 258 tonnes (254 long tons) while submerged. She had a total length of 34.68 m (113 ft 9 in) (o/a), a beam width of 3.02 m (9 ft 11 in) (o/a), and a draught depth of 3.66 m (12 ft). The submarine was powered by one MWM six-cylinder RS134S diesel engine providing 575–630 metric horsepower (423–463 kilowatts; 567–621 shaft horsepower), one AEG GU4463-8 double-acting electric motor electric motor providing 580 PS (430 kW; 570 shp), and one BBC silent running CCR188 electric motor providing 35 PS (26 kW; 35 shp).
The submarine had a maximum surface speed of 9.7 knots (18.0 km/h; 11.2 mph) and a submerged speed of 12.5 knots (23.2 km/h; 14.4 mph). When submerged, the boat could operate at 4 knots (7.4 km/h; 4.6 mph) for 194 nautical miles (359 km; 223 mi); when surfaced, she could travel 2,600 nautical miles (4,800 km; 3,000 mi) at 8 knots (15 km/h; 9.2 mph). U-4703 was fitted with two 53.3 cm (21 in) torpedo tubes in the bow. She could carry two preloaded torpedoes. The complement was 14–18 men. This class of U-boat did not carry a deck gun.
On 5 May 1945, U-4703 was scuttled in Gelting Bay near Gelting as part of Operation Regenbogen. The wreck was later raised and broken up.