# SM UB-40

SM UB-40 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I.

## Design

A Type UB II submarine, UB-40 had a displacement of 274 tonnes (270 long tons) when at the surface and 303 tonnes (298 long tons) while submerged. She had a total length of 36.90 m (121 ft 1 in), a beam of 4.37 m (14 ft 4 in), and a draught of 3.69 m (12 ft 1 in). The submarine was powered by two Körting six-cylinder diesel engines producing a total 284 metric horsepower (280 shp; 209 kW), two Siemens-Schuckert electric motors producing 280 metric horsepower (210 kW; 280 shp), and one propeller shaft. She was capable of operating at depths of up to 50 metres (160 ft).
The submarine had a maximum surface speed of 9.15 knots (16.95 km/h; 10.53 mph) and a maximum submerged speed of 5.81 knots (10.76 km/h; 6.69 mph). When submerged, she could operate for 45 nautical miles (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 6,450 nautical miles (11,950 km; 7,420 mi) at 5 knots (9.3 km/h; 5.8 mph). UB-40 was fitted with two 50 centimetres (20 in) torpedo tubes, four torpedoes, and one 8.8 cm (3.5 in) Uk L/30 deck gun. She had a complement of twenty-one crew members and two officers and a 42-second dive time.

## Construction and career

The U-boat was ordered on 22 July 1915 and launched on 25 April 1916. She was commissioned into the German Imperial Navy on 17 August 1916 as SM UB-40.
The submarine sank 100 ships in 28 patrols. UB-40 was scuttled in Ostend when the German army retreated from Belgium on 5 October 1918.
The wreck of UB-40 has been located & identified by divers in the recent years.

## Summary of raiding history

| Date | Name | Nationality | Tonnage | Fate |
| 20 October 1916 | Barbara | United Kingdom | 3,740 | Sunk |
| 21 October 1916 | Cock O’ the Walk | United Kingdom | 111 | Sunk |
| 22 October 1916 | Maris Stella | France | 106 | Sunk |
| 22 October 1916 | Risøy | Norway | 1,129 | Sunk |
| 7 November 1916 | Reime | Norway | 1,913 | Sunk |
| 8 November 1916 | Killellan | United Kingdom | 1,971 | Sunk |
| 16 November 1916 | Alphonse Marceline | Belgium | 60 | Sunk |
| 16 November 1916 | Vanguard | United Kingdom | 142 | Sunk |
| 17 November 1916 | Saint Rogatien | France | 1,581 | Sunk |
| 21 November 1916 | Alice | France | 822 | Sunk |
| 21 November 1916 | Palm Beach | United Kingdom | 3,891 | Damaged |
| 22 November 1916 | Houlgate | France | 1,550 | Sunk |
| 22 November 1916 | City of Mexico | Norway | 1,511 | Sunk |
| 22 November 1916 | Grenada | United Kingdom | 2,268 | Sunk |
| 28 December 1916 | Oldambt | Netherlands | 470 | Captured as prize |
| 5 February 1917 | Anna Prosper | Belgium | 70 | Sunk |
| 5 February 1917 | Emerald | United Kingdom | 57 | Sunk |
| 21 February 1917 | Alice | Norway | 709 | Sunk |
| 25 February 1917 | Maria Adriana | Netherlands | 88 | Sunk |
| 26 February 1917 | Tammerfors | Russian Empire | 994 | Sunk |
| 28 February 1917 | Immaculee Conception | France | 36 | Sunk |
| 25 March 1917 | Etoile De La Mer | France | 43 | Sunk |
| 25 March 1917 | Felix Faure | France | 37 | Sunk |
| 25 March 1917 | Louise | France | 45 | Sunk |
| 25 March 1917 | Marie Louise | France | 34 | Sunk |
| 25 March 1917 | Saint Joseph | France | 35 | Sunk |
| 29 March 1917 | Conoid | United Kingdom | 165 | Sunk |
| 29 March 1917 | Irma | France | 32 | Sunk |
| 30 March 1917 | Somme | United Kingdom | 1,828 | Sunk |
| 15 April 1917 | Möhlenpris | Norway | 638 | Sunk |
| 16 April 1917 | Cairndhu | United Kingdom | 4,109 | Sunk |
| 16 April 1917 | Victoria | United Kingdom | 165 | Sunk |
| 17 April 1917 | HMHS Lanfranc | Royal Navy | 6,287 | Sunk |
| 19 April 1917 | Limeleaf | United Kingdom | 7,339 | Damaged |
| 3 May 1917 | Clodmoor | United Kingdom | 3,753 | Sunk |
| 15 May 1917 | Cuba | United Kingdom | 271 | Sunk |
| 16 May 1917 | Highland Corrie | United Kingdom | 7,583 | Sunk |
| 16 May 1917 | Pagenturm | United Kingdom | 5,000 | Sunk |
| 17 May 1917 | Florence Louisa | United Kingdom | 115 | Sunk |
| 20 May 1917 | Porthkerry | United Kingdom | 1,920 | Sunk |
| 20 May 1917 | Tycho | United Kingdom | 3,216 | Sunk |
| 21 May 1917 | Jupiter | United Kingdom | 2,124 | Sunk |
| 7 June 1917 | Mahopac | United Kingdom | 3,216 | Damaged |
| 7 June 1917 | Oldfield Grange | United Kingdom | 4,653 | Damaged |
| 8 June 1917 | Phantom | United Kingdom | 251 | Sunk |
| 9 June 1917 | Eugene Mathilde | France | 15 | Sunk |
| 9 June 1917 | Francois Georgette | France | 7 | Sunk |
| 10 June 1917 | Henri Jeanne | France | 9 | Sunk |
| 10 June 1917 | Madeleine | France | 7 | Sunk |
| 11 June 1917 | Eustace | United Kingdom | 3,995 | Damaged |
| 11 June 1917 | Huntsholm | United Kingdom | 2,073 | Sunk |
| 11 June 1917 | Margarita | United Kingdom | 2,788 | Damaged |
| 12 June 1917 | Alfred | United Kingdom | 130 | Sunk |
| 27 June 1917 | Solway Prince | United Kingdom | 317 | Sunk |
| 28 June 1917 | Marguerite | France | 1,544 | Sunk |
| 28 June 1917 | Northfield | United Kingdom | 2,099 | Damaged |
| 30 June 1917 | Borgund I | Norway | 764 | Sunk |
| 30 June 1917 | Chateau Yquem | France | 1,913 | Sunk |
| 15 July 1917 | Dinorwic | United Kingdom | 124 | Sunk |
| 15 July 1917 | Ebenezer | United Kingdom | 177 | Sunk |
| 20 July 1917 | L. H. Carl | United Kingdom | 1,916 | Sunk |
| 20 July 1917 | Salsette | United Kingdom | 5,842 | Sunk |
| 22 July 1917 | Rota | United Kingdom | 2,171 | Sunk |
| 12 August 1917 | Marie Alfred | France | 159 | Sunk |
| 12 August 1917 | Pauline Louisa | France | 172 | Sunk |
| 14 August 1917 | Tuddal | Norway | 3,511 | Sunk |
| 15 August 1917 | Brodstone | United Kingdom | 4,927 | Sunk |
| 16 August 1917 | Eastgate | United Kingdom | 4,277 | Damaged |
| 19 August 1917 | Glocliffe | United Kingdom | 2,211 | Sunk |
| 21 September 1917 | Radaas | Denmark | 2,524 | Sunk |
| 22 September 1917 | Greleen | United Kingdom | 2,286 | Sunk |
| 23 September 1917 | Rosehill | United Kingdom | 2,788 | Sunk |
| 25 September 1917 | City of Swansea | United Kingdom | 1,375 | Sunk |
| 19 October 1917 | Wellington | United Kingdom | 5,600 | Damaged |
| 24 October 1917 | Gallia | Kingdom of Italy | 2,728 | Sunk |
| 25 October 1917 | Gefion | United Kingdom | 1,123 | Sunk |
| 28 October 1917 | Redesmere | United Kingdom | 2,123 | Sunk |
| 17 November 1917 | Abaris | United Kingdom | 2,892 | Damaged |
| 17 November 1917 | Western Coast | United Kingdom | 1,394 | Sunk |
| 19 November 1917 | Aparima | United Kingdom | 5,704 | Sunk |
| 9 December 1917 | Sedbergh | United Kingdom | 4,275 | Damaged |
| 27 January 1918 | Carolus | Norway | 1,041 | Sunk |
| 29 January 1918 | Butetown | United Kingdom | 1,829 | Sunk |
| 20 February 1918 | Huntsmoor | United Kingdom | 4,957 | Sunk |
| 25 February 1918 | Nyanza | United Kingdom | 6,695 | Damaged |
| 16 March 1918 | Author | United Kingdom | 5,586 | Damaged |
| 21 March 1918 | Ikeda | United Kingdom | 6,311 | Sunk |
| 18 April 1918 | Pentyrch | United Kingdom | 3,312 | Sunk |
| 26 May 1918 | Dayspring | United Kingdom | 57 | Sunk |
| 26 May 1918 | Eclipse | United Kingdom | 47 | Sunk |
| 26 May 1918 | Fortuna | United Kingdom | 61 | Sunk |
| 31 May 1918 | Alert | United Kingdom | 59 | Sunk |
| 3 June 1918 | Antiope | United Kingdom | 3,004 | Damaged |
| 6 June 1918 | Active | United Kingdom | 57 | Sunk |
| 6 June 1918 | Beryl | United Kingdom | 57 | Sunk |
| 6 June 1918 | Dianthus | United Kingdom | 51 | Sunk |
| 29 June 1918 | Grekland | Sweden | 2,751 | Sunk |
| 29 June 1918 | Florentia | United Kingdom | 3,688 | Sunk |
| 1 July 1918 | Charing Cross | United Kingdom | 2,534 | Sunk |
| 2 July 1918 | Admiral | United Kingdom | 102 | Sunk |
| 2 July 1918 | Madeleine | France | 158 | Damaged |
| 2 July 1918 | Nord | France | 409 | Sunk |
| 7 July 1918 | Aby | United Kingdom | 15 | Sunk |
| 7 July 1918 | Albion | United Kingdom | 22 | Sunk |
| 7 July 1918 | Leeds | United Kingdom | 161 | Damaged |
| 26 July 1918 | Boy Jack | United Kingdom | 57 | Sunk |
| 26 July 1918 | Godesgenage | Belgium | 40 | Sunk |
| 27 July 1918 | Counsellor | United Kingdom | 56 | Sunk |
| 27 July 1918 | Fear Not | United Kingdom | 59 | Sunk |
| 27 July 1918 | I’ll Try | United Kingdom | 51 | Sunk |
| 27 July 1918 | Kirkham Abbey | United Kingdom | 1,166 | Sunk |
| 27 July 1918 | Le Bijou | United Kingdom | 46 | Sunk |
| 27 July 1918 | Paragon | United Kingdom | 56 | Sunk |
| 27 July 1918 | Passion Flower | United Kingdom | 46 | Sunk |
| 27 July 1918 | Success | United Kingdom | 54 | Sunk |
| 27 July 1918 | Valour | United Kingdom | 39 | Sunk |
| 28 July 1918 | Francis Robert | United Kingdom | 44 | Sunk |