German submarine U-1228

	U-1228 surrenders at Portsmouth, New Hampshire on 17 May 1945 escorted by USCGC Dione (center)
History
Nazi Germany
Name	U-1228
Ordered	14 October 1941
Builder	Deutsche Werft AG, Hamburg
Yard number	391
Laid down	16 February 1943
Launched	2 October 1943
Commissioned	22 December 1943
Fate	Surrendered on 17 May 1945; Sunk on 5 February 1946 by US warships in position 42°32′N 69°37′W / 42.533°N 69.617°W;
General characteristics
Class & type	Type IXC/40 submarine
Displacement	1,144 t (1,126 long tons) surfaced; 1,257 t (1,237 long tons) submerged;
Length	76.76 m (251 ft 10 in) o/a; 58.75 m (192 ft 9 in) pressure hull;
Beam	6.86 m (22 ft 6 in) o/a; 4.44 m (14 ft 7 in) pressure hull;
Height	9.60 m (31 ft 6 in)
Draught	4.67 m (15 ft 4 in)
Installed power	4,400 PS (3,200 kW; 4,300 bhp) (diesels); 1,000 PS (740 kW; 990 shp) (electric);
Propulsion	2 shafts; 2 × diesel engines; 2 × electric motors;
Speed	18.3 knots (33.9 km/h; 21.1 mph) surfaced; 7.3 knots (13.5 km/h; 8.4 mph) submerged;
Range	13,850 nmi (25,650 km; 15,940 mi) at 10 knots (19 km/h; 12 mph) surfaced; 63 nmi (117 km; 72 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged;
Test depth	230 m (750 ft)
Complement	4 officers, 44 enlisted
Armament	6 × torpedo tubes (4 bow, 2 stern); 22 × 53.3 cm (21 in) torpedoes; 1 × 10.5 cm (4.1 in) SK C/32 deck gun (180 rounds); 1 × 3.7 cm (1.5 in) Flak M42 AA gun; 2 x twin 2 cm (0.79 in) C/30 AA guns;
Service record
Part of	31st U-boat Flotilla; 22 December 1943 – 31 July 1944; 2nd U-boat Flotilla; 1 August – 31 October 1944; 33rd U-boat Flotilla; 1 November 1944 – 8 May 1945;
Identification codes	M 55 286
Commanders	Oblt.z.S. Friedrich-Wilhelm Marienfeld; 22 December 1943 – 17 May 1945;
Operations	3 patrols:; 1st patrol:; a. 11 – 15 September 1944; b. 17 – 20 September 1944; 2nd patrol:; a. 12 October – 29 December 1944; b. 31 December 1944 – 4 January 1945; c. 1 – 3 April 1945; d. 9 – 11 April 1945; 3rd patrol:; 14 April – 17 May 1945;
Victories	1 warship sunk ; (900 tons)

German submarine U-1228 was a Type IXC/40 U-boat built for Nazi Germany's Kriegsmarine during World War II.