SM U-22 (Austria-Hungary)

When it became apparent to the Austro-Hungarian Navy that the First World War would not be a short one,[1] they moved to bolster their U-boat fleet by seizing the plans for the Danish Havmanden class submarines,[2] three of which had been built at Whitehead & Co. in Fiume.[6] Although the Austro-Hungarian Navy was not happy with the design, which was largely obsolete,[7][8] it was the only design for which plans were available and which could be begun immediately in domestic shipyards.[8] The Austro-Hungarian Navy unenthusiastically placed orders for U-22 and her three sister boats on 27 March 1915.[1]

U-22 was one of two boats of the class to be built at the Hungarian UBAG yard in Fiume.[2] Due to demands by the Hungarian government,[1] subcontracts for the class were divided between Hungarian and Austrian firms,[4] and this politically expedient solution worsened technical problems with the design, resulting in numerous modifications and delays for the class in general.[2]

U-22 was an ocean-going submarine that displaced 173 tonnes (191 short tons) surfaced and 210 tonnes (231 short tons) submerged and was designed for a complement of 18. She was 127 feet 2 inches (38.76 m) long with a beam of 13 feet (4.0 m) and a draft of 9 feet (2.7 m). For propulsion, she featured a single shaft, a single 450 bhp (340 kW) diesel engine for surface running, and a single 160 shp (120 kW) electric motor for submerged travel.[4] She was capable of 12 knots (22 km/h) while surfaced and 9 knots (17 km/h) while submerged. Although there is no specific notation of a range for U-22, the Havmanden class, upon which the U-20 class was based, had a range of 1,400 nautical miles (2,600 km) at 10 knots (19 km/h), surfaced, and 23 nautical miles (43 km) at 8 knots (15 km/h) submerged.[6]

U-22 was armed with two 45 cm (17.7 in) torpedo tubes located in the front and carried a complement of two torpedoes. She was also equipped with a 66 mm (2.6 in) deck gun and an 8 mm (0.31 in) machine gun.[4]

U-22 was laid down at Fiume in mid 1915 and launched on 27 January 1917, the last of the four U-20-class boats to be launched.[4] On 10 June, while not yet complete, the U-boat sank in the harbor at Fiume. Raised from her resting point at a depth of 9 meters (30 ft) the following day, U-22 underwent four months of repairs. She was launched again on 6 October.[3]

On 18 November 1917 the U-boat sailed for Pola, where she was commissioned as SM U-22 on 23 November under the command of Linienschiffsleutnant Josef Holub.[5] The 31-year-old Galician had been assigned to U-22 in February and had been in charge of sister boat U-21 from June 1916 until his assignment to U-22.[9]

Holub led U-22 out on her first patrol when they departed Pola on 5 December for duty off the Po estuary. After returning to Pola on 10 December, Holub led U-22 on another Po estuary tour from 15 to 17 December.[3] On 29 December, Holub was transferred to U-27. His replacement was Linienschiffsleutnant Friedrich Sterz. It was the first U-boat command of the 25-year-old native of Pergine, Tyrolia (in present-day Italy).[10][Note 1]

On 3 January 1918, Sterz returned U-22 to the Po estuary for a third patrol there. While in the area, an enemy submarine was spotted but no attack could be made because of bad weather; the same bad weather forced U-22 to put in at Rovigno the following day. Setting out from Rovigno on 5 January, U-22 unsuccessfully attacked an Italian torpedo boat and two steamships. After a return to Rovigno on 6 January, Sterz steered his boat to the submarine base at Brioni. Ten days later, U-22 headed to Trieste, where she conducted patrols in the northern Adriatic. On 5 February, U-22 avoided being hit by seven bombs dropped by an enemy airplane. Departing the northern Adriatic in late April, U-22 was headed for Cattaro when her electric motor failed. After a quick stop at Cattaro, U-22 returned to Pola for three months of repairs.[3]

After returning to service in August, U-22 operated out of Catttaro, patrolling off the Montenegrin coast over the next two months.[3] On 17 October, the boat returned to Cattaro,[3] where she remained until the war's end.[11] She was ceded to France as a war reparation and scrapped in 1920.[2] Like all of her sister boats,[2] U-22 had no wartime successes.[5]