# SM UC-25

SM UC-25 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 29 August 1915 and was launched on 10 June 1916. She was commissioned into the German Imperial Navy on 28 June 1916 as SM UC-25. In 13 patrols UC-25 was credited with sinking 21 ships, either by torpedo or by mines laid. From March to September 1918, she was commanded by Karl Dönitz, later grand admiral in charge of all U-boats in World War II. UC-25 was scuttled at Pola on 28 October 1918 on the surrender of Austria-Hungary.

## Design

A Type UC II submarine, UC-25 had a displacement of 400 tonnes (390 long tons) when at the surface and 480 tonnes (470 long tons) while submerged. She had a length overall of 49.45 m (162 ft 3 in), a beam of 5.22 m (17 ft 2 in), and a draught of 3.68 m (12 ft 1 in). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 250 metric horsepower (180 kW; 250 shp) (a total of 500 metric horsepower (370 kW; 490 shp)), two electric motors producing 460 metric horsepower (340 kW; 450 shp), and two propeller shafts. She had a dive time of 48 seconds and was capable of operating at a depth of 50 metres (160 ft).
The submarine had a maximum surface speed of 11.6 knots (21.5 km/h; 13.3 mph) and a submerged speed of 6.6 knots (12.2 km/h; 7.6 mph). When submerged, she could operate for 53 nautical miles (98 km; 61 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 9,260 nautical miles (17,150 km; 10,660 mi) at 7 knots (13 km/h; 8.1 mph). UC-25 was fitted with six 100 centimetres (39 in) mine tubes, eighteen UC 200 mines, three 50 centimetres (20 in) torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 8.8 cm (3.5 in) Uk L/30 deck gun. Her complement was twenty-six crew members.

## Summary of raiding history

| Date | Name | Nationality | Tonnage | Fate |
| 19 October 1916 | Jug | Russian Empire | 75 | Sunk |
| 6 December 1916 | Shchit | Imperial Russian Navy | 248 | Sunk |
| 6 April 1917 | Cybele | France | 148 | Sunk |
| 7 April 1917 | Edwin R. Hunt | United States | 1,132 | Sunk |
| 28 April 1917 | Juliette | France | 50 | Sunk |
| 15 May 1917 | Boutefeu | French Navy | 703 | Sunk |
| 16 May 1917 | HMS Dartmouth | Royal Navy | 5,250 | Damaged |
| 24 May 1917 | Domenico Barone | Kingdom of Italy | 171 | Sunk |
| 28 May 1917 | Nuovo S. Giovanni | Kingdom of Italy | 31 | Sunk |
| 28 May 1917 | San Domenico | Kingdom of Italy | 27 | Sunk |
| 31 May 1917 | Ninotto | Kingdom of Italy | 208 | Sunk |
| 1 June 1917 | Domenico Miscuraca | Kingdom of Italy | 194 | Sunk |
| 1 June 1917 | Vittoria | Kingdom of Italy | 248 | Sunk |
| 6 June 1917 | Mitra | United Kingdom | 5,592 | Damaged |
| 4 July 1917 | HMS Aster | Royal Navy | 1,250 | Sunk |
| 4 July 1917 | HMS Azalea | Royal Navy | 1,250 | Damaged |
| 5 July 1917 | Eburna | United Kingdom | 4,735 | Damaged |
| 17 October 1917 | HMHS Goorkha | Royal Navy | 6,335 | Damaged |
| 18 October 1917 | Anna Scotto | Kingdom of Italy | 594 | Sunk |
| 20 October 1917 | Virginia Gentile | Kingdom of Italy | 164 | Sunk |
| 3 December 1917 | Melo | Kingdom of Italy | 1,115 | Sunk |
| 8 December 1917 | Chyebassa | United Kingdom | 6,249 | Damaged |
| 23 February 1918 | HMT Marion | Royal Navy | 255 | Sunk |
| 18 March 1918 | Massilia | Kingdom of Italy | 5,026 | Sunk |
| 4 April 1918 | Agatina | Kingdom of Italy | 201 | Sunk |
| 28 July 1918 | Vesuvio | Kingdom of Italy | 5,459 | Damaged |
| 29 July 1918 | Rio Pallaresa | United Kingdom | 4,043 | Sunk |
| 5 August 1918 | Freshfield | Canada | 3,445 | Sunk |