SM UB-33
SM UB-33 was a German Type UB II submarine or U-boat in the German Imperial Navy () 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. The submarine sank thirteen ships, damaged two others, and took a further three as prizes in seventeen patrols. Design
A German Type UB II submarine, UB-33 had a displacement of  when at the surface and  while submerged. She had a total length of , a beam of , and a draught of . The submarine was powered by two Benz six-cylinder diesel engines producing a total , two Siemens-Schuckert electric motors producing , and one propeller shaft. She was capable of operating at depths of up to . The submarine had a maximum surface speed of  and a maximum submerged speed of . When submerged, she could operate for  at ; when surfaced, she could travel  at . UB-33 was fitted with two  torpedo tubes, four torpedoes, and one  Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time. Fate

UB-33 was mined and sunk around the Varne Bank on 11 April 1918. The wreck of UB-33 lies  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. The wreck is officially classified as a war grave and therefore it cannot be deliberately destroyed. Summary of raiding history

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1915 ships
Ships built in Hamburg
World War I submarines of Germany
German Type UB II submarines
U-boats commissioned in 1916
Maritime incidents in 1918
U-boats sunk in 1918
U-boats sunk by mines
World War I shipwrecks in the English Channel
Submarines lost with all hands