SM U-93 was one of the 329 submarines serving in the Imperial German Navy in World War I. U-93 was engaged in the naval warfare and took part in the First Battle of the Atlantic.
Type U 93 submarines were preceded by the shorter Type U 87 submarines. U-93 had a displacement of 838t when at the surface and 1000t while submerged. She had a total length of 71.55m (234.74feet), a pressure hull length of 56.05m (183.89feet), a beam of 6.3m (20.7feet), a height of 8.25m (27.07feet), and a draught of 3.94m (12.93feet). The submarine was powered by two 2400PS engines for use while surfaced, and two 1200PS engines for use while submerged. She had two propeller shafts. 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 . U-93 was fitted with six torpedo tubes (four at the bow and two at the stern), twelve to sixteen torpedoes, and one 8.8sp=usNaNsp=us SK L/30 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).
After February 1917 she was commanded by the late author of books (e.g. U boat 202. The war diary of a German submarine, 1919) and experienced submarine commander Edgar von Spiegel von und zu Peckelsheim
On 30 April 1917 about south of Ireland, in the Atlantic, U-93 attacked HMS Prize, a three-masted topsail schooner (one of the Q ships) commanded by Lieutenant William Edward Sanders (who received a Victoria Cross for the action). HMS Prize was damaged by shellfire. After the 'panic party' had taken to the boats and the ship appeared to be sinking, the U-boat approached to within 80yds of her port quarter, whereupon the White Ensign was hoisted and the Prize opened fire.
Within a few minutes the submarine was on fire and her bows rose in the air, whilst the Prize was further damaged. The U-boat disappeared from sight, and was believed to have been sunk by the crew of the Prize and by several of the German crew (including her captain) who had been blown or jumped into the sea.
Neither of the crippled ships had sunk, with the Prize being towed in flames back to Kinsale, while the U-93 struggled back to the Sylt nine days later after a dramatic escape effort through the British mine and destroyer barrages off Dover.
U 93 after repairs operated in the English channel. She was lost to unknown cause off Hardelot, France in January 1918. The wreck was located by divers in 2003.[1]
| Date | Name | Nationality | Tonnage[2] | Fate[3] | |
|---|---|---|---|---|---|
| 15 April 1917 | Fram |  Denmark | 105 | Sunk | |
| 18 April 1917 | Troldfos |  Norway | 1,459 | Sunk | |
| 18 April 1917 | West Lothian | Norway | 1,887 | Sunk | |
| 22 April 1917 | Vestelv | Norway | 1,729 | Sunk | |
| 28 April 1917 | Diana | Denmark | 207 | Damaged | |
| 29 April 1917 | Comedian |  United Kingdom | 4,889 | Sunk | |
| 29 April 1917 | Ikbal | United Kingdom | 5,434 | Sunk | |
| 30 April 1917 | Ascaro | 3,245 | Sunk | ||
| 30 April 1917 | Horsa | United Kingdom | 2,949 | Sunk | |
| 30 April 1917 | Parthenon |  Greece | 2,934 | Sunk | |
| 30 April 1917 | HMS Prize | 199 | Damaged | ||
| 19 June 1917 | Louise | Norway | 645 | Sunk | |
| 27 June 1917 | Baron Ogilvy | United Kingdom | 4,570 | Sunk | |
| 4 July 1917 | Kodan | Denmark | 308 | Sunk | |
| 12 August 1917 | Bestum | Norway | 3,520 | Sunk | |
| 14 August 1917 | Asti | 5,300 | Sunk | ||
| 20 August 1917 | Elswick Lodge | United Kingdom | 3,558 | Sunk | |
| 21 August 1917 | Volodia | United Kingdom | 5,689 | Sunk | |
| 23 August 1917 | Carl F. Cressy |  United States | 898 | Sunk | |
| 25 August 1917 | Heatherside | United Kingdom | 2,767 | Sunk | |
| 25 August 1917 | Ovar |  Portugal | 1,650 | Sunk | |
| 26 August 1917 | Marmion | United Kingdom | 4,066 | Sunk | |
| 26 August 1917 | Minas Queen |  Canada | 492 | Sunk | |
| 29 August 1917 | Treloske | United Kingdom | 3,071 | Sunk | |
| 18 October 1917 | Macao |  Brazil | 3,557 | Sunk | |
| 27 October 1917 | D. N. Luckenbach | United States | 2,929 | Sunk | |
| 28 October 1917 | USAT Finland | 12,222 | Damaged | ||
| 29 October 1917 | La Epoca |  Uruguay | 2,432 | Sunk | |
| 30 October 1917 | Liff | Norway | 2,521 | Sunk | |
| 2 January 1918 | Veda | United Kingdom | 25 | Sunk | |
| 4 January 1918 | Goeland I | 235 | Sunk | ||
| 6 January 1918 | Kanaris | Greece | 3,793 | Sunk | |
| 6 January 1918 | Harry Luckenbach | United States | 2,798 | Sunk | |
| 6 January 1918 | Henri Lecour |  France | 2,488 | Sunk | |
| 6 January 1918 | Dagny | Denmark | 1,220 | Sunk | |
| 14 January 1918 | Babin Chevaye | France | 2,174 | Sunk | |
| 15 January 1918 | War Song | United Kingdom | 2,535 | Sunk |