# SM UC-3

SM UC-3 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 28 May 1915. She was commissioned into the German Imperial Navy on 1 June 1915 as UC-3. Mines laid by UC-3 in her 29 patrols were credited with sinking 22 ships and damaging 2 others. UC-3 was caught in a net, detected by hydrophone, and sunk on 23 April 1916 or mined and sunk on 27 May 1916.

## Design

A Type UC I submarine, UC-3 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-3 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.

## Fate

UC-3 was the first submarine to be detected and sunk using a hydrophone. UC-3's fate have different version: One is on 23 April 1916 she was detected using a hydrophone, trapped in a net, and then quickly sunk after a large explosion. The ship that sank her was the anti-submarine trawler Cheerio, captained by Thomson. Another is on 27 May 1916, she got mined and sunk.

## Summary of raiding history

| Date | Name | Nationality | Tonnage | Fate |
| 5 July 1915 | Peik | Norway | 1,168 | Sunk |
| 14 July 1915 | Vivid | Belgium | 150 | Sunk |
| 20 July 1915 | HMY Rhiannon | Royal Navy | 137 | Sunk |
| 21 July 1915 | HMT Briton | Royal Navy | 196 | Sunk |
| 12 September 1915 | Ashmore | United Kingdom | 2,519 | Sunk |
| 14 October 1915 | Salerno | United Kingdom | 2,071 | Sunk |
| 16 October 1915 | Volscian | United Kingdom | 570 | Damaged |
| 17 October 1915 | HMT Javelin | Royal Navy | 205 | Sunk |
| 25 October 1915 | Selma | Norway | 1,654 | Sunk |
| 6 November 1915 | Alastair | United Kingdom | 366 | Sunk |
| 11 November 1915 | Rhineland | United Kingdom | 1,501 | Sunk |
| 17 November 1915 | Ulriken | Norway | 2,379 | Sunk |
| 29 November 1915 | HMS Duchess of Hamilton | Royal Navy | 553 | Sunk |
| 10 December 1915 | Nereus | Norway | 742 | Sunk |
| 11 December 1915 | Pinegrove | United Kingdom | 2,847 | Sunk |
| 18 December 1915 | Nico | Norway | 712 | Sunk |
| 21 December 1915 | HMS Lady Ismay | Royal Navy | 495 | Sunk |
| 27 December 1915 | Hadley | United Kingdom | 1,777 | Sunk |
| 14 January 1916 | Breslau | United Kingdom | 1,339 | Damaged |
| 18 January 1916 | Auvergne | French Navy | 523 | Sunk |
| 8 February 1916 | Argo | United Kingdom | 1,720 | Sunk |
| 28 February 1916 | Thornaby | United Kingdom | 1,782 | Sunk |
| 26 May 1916 | Denewood | United Kingdom | 1,221 | Sunk |
| 3 June 1916 | Golconda | United Kingdom | 5,874 | Sunk |