SM UB-34 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 10 June 1916 as SM UB-34.
UB-34 sank 31 ships in 21 patrols. They included the William Cory and Son collier SS Hurstwood, which UB-34 torpedoed and sank in the North Sea off Whitby on 5 February 1917.
The submarine served in the Training Flotilla at the end of the war and was surrendered on 26 November 1918 in accordance with the requirements of the Armistice with Germany. UB-34 was broken up in Canning Town in 1922.
A Type UB II submarine, UB-34 had a displacement of 274t when at the surface and 303t while submerged. She had a total length of 36.9m (121.1feet), a beam of 4.37m (14.34feet), and a draught of 3.69m (12.11feet). The submarine was powered by two Benz six-cylinder diesel engines producing a total 270PS, two Siemens-Schuckert electric motors producing 280PS, 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-34 was fitted with two torpedo tubes, four torpedoes, and one 8.8sp=usNaNsp=us Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.
| Date | Name | Nationality | Tonnage[1] | Fate[2] | |
|---|---|---|---|---|---|
| 21 October 1916 | Ull |  Norway | 1,139 | Sunk | |
| 22 October 1916 | Effort |  United Kingdom | 159 | Sunk | |
| 23 October 1916 | Regina | Norway | 823 | Sunk | |
| 26 October 1916 | Titan | United Kingdom | 171 | Sunk | |
| 18 December 1916 | Arran | United Kingdom | 176 | Sunk | |
| 19 December 1916 | Ansgar | Norway | 926 | Sunk | |
| 19 December 1916 | Kornmo | Norway | 591 | Sunk | |
| 19 December 1916 | Bretland |  Denmark | 2,025 | Captured as prize | |
| 20 December 1916 | Eva | Denmark | 109 | Sunk | |
| 20 December 1916 | Mereddio |  Sweden | 1,372 | Sunk | |
| 5 February 1917 | Hurstwood | United Kingdom | 1,229 | Sunk | |
| 6 February 1917 | Ferruccio | 2,192 | Sunk | ||
| 7 February 1917 | Corsican Prince | United Kingdom | 2,776 | Sunk | |
| 7 February 1917 | Saint Ninian | United Kingdom | 3,026 | Sunk | |
| 25 April 1917 | Este | Denmark | 1,420 | Sunk | |
| 7 September 1917 | Grelfryda | United Kingdom | 5,136 | Damaged | |
| 8 September 1917 | Aladdin | Norway | 753 | Sunk | |
| 27 September 1917 | Greltoria | United Kingdom | 5,143 | Sunk | |
| 29 September 1917 | Bertha |  Netherlands | 185 | Captured as prize | |
| 27 October 1917 | Lady Helen | United Kingdom | 811 | Sunk | |
| 13 December 1917 | Bangarth | United Kingdom | 1,872 | Sunk | |
| 15 December 1917 | Dafni |  Greece | 1,190 | Sunk | |
| 24 January 1918 | HMT Desire | 135 | Sunk | ||
| 24 January 1918 | X6 | United Kingdom | 160 | Sunk | |
| 24 January 1918 | X110 | United Kingdom | 160 | Sunk | |
| 25 January 1918 | Folmina | Netherlands | 1,158 | Sunk | |
| 25 January 1918 | Humber | United Kingdom | 280 | Sunk | |
| 26 January 1918 | Hartley | United Kingdom | 1,150 | Sunk | |
| 26 January 1918 | Athos | Norway | 1,708 | Sunk | |
| 9 March 1918 | Randelsborg | Denmark | 1,551 | Sunk | |
| 13 March 1918 | Adine | Norway | 2,235 | Sunk | |
| 16 March 1918 | Quintero | Denmark | 1,611 | Sunk | |
| 21 April 1918 | Lompoc | United Kingdom | 7,270 | Damaged | |
| 10 June 1918 | Lowtyne | United Kingdom | 3,231 | Sunk | |
| 22 September 1918 | HMT Elise | 239 | Sunk |