SM U-22^{[Note 1]} was one of 329 submarines serving in the Imperial German Navy in World War I. U-22 was engaged in commerce war as part of the naval warfare, during the First Battle of the Atlantic.

A German WWI period postcard of U-22
History
German Empire
Name	U-22
Ordered	25 November 1910
Builder	Kaiserliche Werft Danzig
Cost	2,450,000 Goldmark
Yard number	16
Laid down	14 November 1911
Launched	6 March 1913
Commissioned	25 November 1913
Fate	Surrendered 1 December 1918; broken up 1919-22
General characteristics
Class and type	German Type U 19 submarine
Displacement	650 t (640 long tons) surfaced 837 t (824 long tons) submerged
Length	64.15 m (210 ft 6 in)
Beam	6.10 m (20 ft)
Height	7.30 m (23 ft 11 in)
Draught	3.58 m (11 ft 9 in)
Propulsion	2 shafts 2 × MAN 8-cylinder two stroke diesel motors with 1,700 PS (1,250 kW; 1,680 shp) 2 × AEG double Motordynamos with 1,200 PS (880 kW; 1,180 shp) 320 rpm submerged
Speed	15.4 knots (28.5 km/h; 17.7 mph) surfaced 9.5 knots (17.6 km/h; 10.9 mph) submerged
Range	9,700 nautical miles (18,000 km; 11,200 mi) at 8 kn surfaced 80 nautical miles (150 km; 92 mi) at 5 kn submerged
Test depth	50 m (164 ft 1 in)
Boats & landing craft carried	1 dingi
Complement	4 officers, 31 men
Armament	4 × 50 cm (19.7 in) torpedo tubes (2 each bow and stern) with 6 torpedoes 1 × 8.8 cm (3.5 in) SK L/30 gun (at times 2 ×)
Service record
Part of:	III Flotilla 1 August 1914 – 23 August 1916 Baltic Flotilla 23 August 1916 – 16 March 1917 III Flotilla 16 March 1917 – 11 November 1918
Commanders:	Kptlt. Bruno Hoppe[1] 25 November 1913 – 22 August 1916 Oblt.z.S. Karl Scherb[2] 23 August 1916 – 31 May 1917 Oblt.z.S. Hinrich Hermann Hashagen[3] 1 June 1917 – 11 November 1918
Operations:	14 patrols
Victories:	41 merchant ships sunk (38,435 GRT) 2 auxiliary warships sunk (8,086 GRT) 3 merchant ships damaged (8,988 GRT) 1 merchant ship taken as prize (1,170 GRT)

U-22 had a career of 14 patrols, sinking 43 ships for a total of 46,521 tons. In addition, she damaged three ships totalling 8,988 tons, and captured 1 prize worth 1,170 tons.

Oblt.z.S. Hashagen was the most successful, sinking 28 of the vessels, the largest being the British passenger steamer California at 5,629 tons. She was sunk 145 nautical miles (269 km; 167 mi) NWxN3/4N of Cape Villano on 17 October 1917.^[4]

U-22 was surrendered to the Allies at Harwich on 1 December 1918 in accordance with the requirements of the Armistice with Germany. She was sold (with one of her engines) by the British Admiralty to Hughes Bolckow on 3 March 1919 for £2,975, and was broken up at Blyth between 25 April 1919 and 1922.^[5]