SM UB-122 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 4 March 1918 as SM UB-122.
UB-148 at sea, a U-boat similar to UB-122.
|Ordered:||6/8 February 1917|
|Builder:||AG Weser, Bremen|
|Cost:||3,654,000 German Papiermark|
|Launched:||2 February 1918|
|Commissioned:||4 March 1918|
|Fate:||Surrendered 24 November 1918.|
|Class and type:||German Type UB III submarine|
|Length:||55.85 m (183 ft 3 in) (o/a)|
|Beam:||5.80 m (19 ft)|
|Draught:||3.72 m (12 ft 2 in)|
|Test depth:||50 m (160 ft)|
|Complement:||3 officers, 31 men|
UB-122 was surrendered to the British on 24 November 1918 in accordance with the requirements of the Armistice with Germany. She may have been broken up in 1921, have been marooned on a sandbank at Hoo on the River Medway, or have foundered in the North Sea off the east coast of England in 1921.
She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 4 March 1918. UB-122 was commissioned later the same year under the command of Oblt.z.S. Alexander Magnus. Like all Type UB III submarines, UB-122 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-122 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,280 nautical miles (13,480 km; 8,380 mi). UB-122 had a displacement of 512 t (504 long tons) while surfaced and 643 t (633 long tons) when submerged. Her engines enabled her to travel at 13.9 knots (25.7 km/h; 16.0 mph) when surfaced and 7.6 knots (14.1 km/h; 8.7 mph) when submerged.
- "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
- Rössler 1979, p. 55.
- Gröner 1991, pp. 25-30.
- Helgason, Guðmundur. "WWI U-boat commanders: Alexander Magnus". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.
- Wreck location shown on Google Maps https://maps.google.co.uk/maps?q=51.430667,0.631983&hl=en&ll=51.430636,0.632014&spn=0.000741,0.002382&sll=52.8382,-2.327815&sspn=5.88034,19.511719&t=h&z=19
- Historic wreckage of German First World War U-boat revealed in low tide Daily Telegraph, 20 Dec 2013
- ANNA EDWARDS (20 December 2013). "A monster off the British coast: Rusting hulk of World War One German U-boat emerges after almost a century". Mail Online.
- "UB 122". Uboat.net. Retrieved 16 November 2012.
- Bendert, Harald (2000). Die UB-Boote der Kaiserlichen Marine, 1914-1918. Einsätze, Erfolge, Schicksal (in German). Hamburg: Verlag E.S. Mittler & Sohn GmbH. ISBN 3-8132-0713-7.
- 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. ISBN 0-85177-593-4.
- Rössler, Eberhard (1979). U-Bootbau bis Ende des 1. Weltkrieges, Konstruktionen für das Ausland und die Jahre 1935 – 1945. Die deutschen U-Boote und ihre Werften (in German). I. Munich: Bernard & Graefe. ISBN 3-7637-5213-7.