SM UB-33 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 22 July 1915 and launched on 5 December 1915. She was commissioned into the German Imperial Navy on 22 April 1916 as SM UB-33.
SM UB-45, a u-boat similar to UB-33
|Ordered:||22 July 1915|
|Builder:||Blohm & Voss, Hamburg|
|Cost:||1,152,000 German Papiermark|
|Launched:||5 December 1915|
|Completed:||20 April 1916|
|Commissioned:||22 April 1916|
|Fate:||sunk 11 April 1918|
|Class and type:||German Type UB II submarine|
|Draught:||3.69 m (12 ft 1 in)|
|Test depth:||50 m (160 ft)|
|Complement:||2 officers, 21 men|
|Notes:||42-second diving time|
|Part of:||Imperial German Navy|
The submarine sank thirteen ships, damaged two others, and took a further three as prizes in seventeen patrols.
A German Type UB II submarine, UB-33 had a displacement of 274 tonnes (270 long tons) when at the surface and 303 tonnes (298 long tons) while submerged. She had a total length of 36.90 m (121 ft 1 in), a beam of 4.37 m (14 ft 4 in), and a draught of 3.69 m (12 ft 1 in). The submarine was powered by two Benz six-cylinder diesel engines producing a total 270 metric horsepower (270 shp; 200 kW), two Siemens-Schuckert electric motors producing 280 metric horsepower (210 kW; 280 shp), and one propeller shaft. She was capable of operating at depths of up to 50 metres (160 ft).
The submarine had a maximum surface speed of 9.06 knots (16.78 km/h; 10.43 mph) and a maximum submerged speed of 5.71 knots (10.57 km/h; 6.57 mph). When submerged, she could operate for 45 nautical miles (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 7,030 nautical miles (13,020 km; 8,090 mi) at 5 knots (9.3 km/h; 5.8 mph). UB-33 was fitted with two 50 centimetres (20 in) torpedo tubes, four torpedoes, and one 8.8 cm (3.5 in) Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.
UB-33 was mined and sunk around the Varne Bank on 11 April 1918. The wreck of UB-33 lies 77 feet (23 m) below the surface of the water. The amount of clearance between the submarine and ships' keels passing directly overhead is very small, making it a risk for the heavy cross-channel ship traffic in the area. In 2007 efforts began to lift and move the wreck to deeper waters to ensure safety for passing ships. The wreck is officially classified as a war grave and therefore it cannot be deliberately destroyed.
Summary of raiding history
|8 June 1917||Kragrö||550||Prize|
|9 June 1917||Götha||720||Prize|
|13 June 1917||Gertie||257||Prize|
|1 January 1918||Genesse||2,892||Damaged|
|8 February 1918||Kia Ora||99||Sunk|
|16 February 1918||Pikepool||3,683||Damaged|
|16 February 1918||Commander||58||Sunk|
|17 February 1918||Northville||2,472||Sunk|
|19 February 1918||Commandant Baratier||324||Sunk|
|20 February 1918||Snow Drop||40||Sunk|
|21 February 1918||Idalia||23||Sunk|
|21 February 1918||Irex||16||Sunk|
|21 February 1918||Leonora||26||Sunk|
|21 February 1918||Oryx||38||Sunk|
|21 February 1918||Rosebud||44||Sunk|
|14 March 1918||Carla||1,668||Sunk|
|15 March 1918||Sparkling Foam||199||Sunk|
|8 April 1918||Nyassaland||383||Sunk|
- "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
- Tonnages are in gross register tons
- Rössler 1979, p. 64.
- Gröner 1991, pp. 23-25.
- Helgason, Guðmundur. "Ships hit by UB 33". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
- Helgason, Guðmundur. "WWI U-boats: UB 33". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
- Gysin, Christian; Rees, Alun (17 August 2007). "The ghost of U-Boat 33: German sub sunk in 1918 threatening to surface in Channel". Mail Online. Associated Newspapers. Retrieved 19 December 2009.
- 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.
- Helgason, Guðmundur. "WWI U-boats: UB 33". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 21 February 2009.