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|Laid down:||October 1912|
|Launched:||9 May 1914|
|Commissioned:||14 August 1914|
|Type:||Norwegian A class submarine|
|Length:||46.70 m (153 ft 3 in) (OA)|
|Beam:||4.78 m (15 ft 8 in)|
|Draught:||2.80 m (9 ft 2 in)|
|Range:||900 nautical miles (1,700 km; 1,000 mi) at 10 kn|
|Test depth:||50 m (160 ft)|
|Complement:||3 officers, 18 men|
|2 × periscopes|
|Part of:||Imperial German Navy|
SM UA[Note 1] was a U-boat of the Imperial German Navy during World War I. Built as the fifth submarine of the Norwegian A class the boat was launched 9 May 1914 and confiscated by the German government after the outbreak of World War I on 5 August 1914. Commissioned as SM U 0 on 14 August 1914 the boat was renamed UA two weeks later and assigned to coastal protection. In 1916 UA was transferred to the Uschule (Submarine School).
After the Armistice with Germany in November 1918 UA was surrendered at Harwich. It was then sold for scrap and was lost on tow off Folkestone. The wreck was identified by archaeologist Innes McCartney in 2013.
- Gothling, Wolfgang; Lorscher, Oliver; Schnetzke, Simon (2012). AUSGELIEFERT Die deutschen B-Boote 1918-1920 und ihr Verbleib - Eine Dokumentation -. digital business and printing gmbh Berlin. p. 80. ISBN 978-3-00-037421-0.
- "Identification of the unique "UA" of the Kaiserliche Marine".
- "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
- Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. p. 48. ISBN 0-85177-593-4.
- Gothling, Wolfgang; Lorscher, Oliver; Schnetzke, Simon (2012). AUSGELIEFERT Die deutschen B-Boote 1918-1920 und ihr Verbleib - Eine Dokumentation -. digital business and printing gmbh Berlin. ISBN 978-3-00-037421-0.