# SM UC-4

SM UC-4 was a German Type UC I minelayer submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat had been ordered by November 1914 and was launched on 6 June 1915. She was commissioned into the German Imperial Navy on 10 June 1915 as SM UC-4. Mines laid by UC-4 in her 73 patrols were credited with sinking 36 ships. UC-4 was scuttled off the coast of Flanders during the German evacuation on 5 October 1918.

## Design

A Type UC I submarine, UC-4 had a displacement of 168 tonnes (165 long tons) when at the surface and 183 tonnes (180 long tons) while submerged. She had a length overall of 33.99 m (111 ft 6 in), a beam of 3.15 m (10 ft 4 in), and a draught of 3.04 m (10 ft). The submarine was powered by one Daimler-Motoren-Gesellschaft six-cylinder, four-stroke diesel engine producing 90 metric horsepower (66 kW; 89 shp), an electric motor producing 175 metric horsepower (129 kW; 173 shp), and one propeller shaft. She was capable of operating at a depth of 50 metres (160 ft).
The submarine had a maximum surface speed of 6.20 knots (11.48 km/h; 7.13 mph) and a maximum submerged speed of 5.22 knots (9.67 km/h; 6.01 mph). When submerged, she could operate for 50 nautical miles (93 km; 58 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 780 nautical miles (1,440 km; 900 mi) at 5 knots (9.3 km/h; 5.8 mph). UC-4 was fitted with six 100 centimetres (39 in) mine tubes, twelve UC 120 mines, and one 8 millimetres (0.31 in) machine gun. She was built by AG Vulcan Stettin and her complement was fourteen crew members.

## Summary of raiding history

| Date | Name | Nationality | Tonnage | Fate |
| 15 August 1915 | Ladoga | Imperial Russian Navy | 6,136 | Sunk |
| 16 August 1915 | Linnea (n-1) | Imperial Russian Navy | 739 | Sunk |
| 12 February 1916 | Aduatiek | Belgium | 2,221 | Sunk |
| 12 February 1916 | Cedarwood | United Kingdom | 654 | Sunk |
| 13 February 1916 | Tergestea | United Kingdom | 4,308 | Sunk |
| 29 February 1916 | Den of Ogil | United Kingdom | 5,689 | Damaged |
| 27 October 1916 | Bygdo | Norway | 2,345 | Sunk |
| 28 October 1916 | Sparta | United Kingdom | 480 | Sunk |
| 9 November 1916 | Sunniside | United Kingdom | 447 | Sunk |
| 25 November 1916 | HMT Burnley | Royal Navy | 275 | Sunk |
| 3 December 1916 | HMT Remarko | Royal Navy | 245 | Sunk |
| 5 December 1916 | HMT Tervani | Royal Navy | 457 | Sunk |
| 7 January 1917 | HMT Donside | Royal Navy | 182 | Sunk |
| 18 January 1917 | Dagmar | Denmark | 758 | Sunk |
| 20 January 1917 | HMT New Comet | Royal Navy | 177 | Sunk |
| 13 February 1917 | HMT Sisters Melville | Royal Navy | 260 | Sunk |
| 23 February 1917 | Grenadier | United Kingdom | 1,004 | Sunk |
| 11 March 1917 | Kwasind | United Kingdom | 2,211 | Sunk |
| 12 March 1917 | Ambient | United Kingdom | 1,517 | Sunk |
| 12 March 1917 | Pontypridd | United Kingdom | 1,556 | Sunk |
| 3 June 1917 | Giralda | United Kingdom | 46 | Sunk |
| 4 July 1917 | Chrysolite | United Kingdom | 57 | Sunk |
| 7 July 1917 | HMT Kelvin | Royal Navy | 322 | Sunk |
| 20 July 1917 | HMS Queen of the North | Royal Navy | 594 | Sunk |
| 5 September 1917 | HMT Eros | Royal Navy | 286 | Sunk |
| 20 October 1917 | HMT Vitality | Royal Navy | 202 | Sunk |
| 11 November 1917 | Lapwing | United Kingdom | 1,192 | Sunk |
| 13 November 1917 | Axminster | United Kingdom | 1,905 | Sunk |
| 23 December 1917 | Grantley Hall | United Kingdom | 4,008 | Sunk |
| 25 February 1918 | Rubio | United Kingdom | 2,395 | Sunk |
| 26 February 1918 | Berwen | United Kingdom | 3,752 | Damaged |
| 5 March 1918 | Coalgas | United Kingdom | 2,257 | Sunk |
| 5 March 1918 | Estrella | United Kingdom | 1,740 | Sunk |
| 5 March 1918 | Tusnastabb | Norway | 1,136 | Sunk |
| 12 April 1918 | Lonhelen | United Kingdom | 1,281 | Sunk |
| 20 April 1918 | HMT Numitor | Royal Navy | 242 | Sunk |
| 25 April 1918 | HMS St. Seiriol | Royal Navy | 928 | Sunk |
| 26 June 1918 | HMT Achilles II | Royal Navy | 225 | Sunk |