SM UC-54 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 12 January 1916 and was launched on 20 March 1917. She was commissioned into the German Imperial Navy on 10 May 1917 as SM UC-54.[1] In eight patrols UC-54 was credited with sinking 18 ships, either by torpedo or by mines laid. UC-54 was scuttled at Trieste on 28 October 1918 on the surrender of Austria-Hungary.
A Type UC II submarine, UC-54 had a displacement of 434t when at the surface and 511t while submerged. She had a length overall of 52.69m (172.87feet), a beam of 5.22m (17.13feet), and a draught of 3.64m (11.94feet). The submarine was powered by two six-cylinder four-stroke diesel engines each producing 290PS300PS (a total of 580PS600PS), two electric motors producing 620PS, and two propeller shafts. She had a dive time of 48 seconds and was capable of operating at a depth of .
The submarine had a maximum surface speed of and a submerged speed of . When submerged, she could operate for at ; when surfaced, she could travel at . UC-54 was fitted with six mine tubes, eighteen UC 200 mines, three torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 8.8sp=usNaNsp=us Uk L/30 deck gun. Her complement was twenty-six crew members.
| Date | Name | Nationality | Tonnage[2] | Fate[3] | |
|---|---|---|---|---|---|
| 4 July 1917 | Hurstside |  United Kingdom | 3,149 | Sunk | |
| 12 July 1917 | Maija | 164 | Sunk | ||
| 13 July 1917 | Loanda |  Portugal | 141 | Sunk | |
| 26 July 1917 | Roberto Ivens | 281 | Sunk | ||
| 7 September 1917 | Myrmidon | United Kingdom | 4,965 | Damaged | |
| 29 January 1918 | Tosho Maru |  Japan | 3,038 | Sunk | |
| 2 February 1918 | Esterel | 238 | Sunk | ||
| 2 February 1918 | Ida | 63 | Sunk | ||
| 6 February 1918 | United Kingdom | 7,263 | Sunk | ||
| 14 March 1918 | Ardandearg | United Kingdom | 3,237 | Sunk | |
| 27 March 1918 | Carlo P. | 61 | Sunk | ||
| 3 April 1918 | Sylvie |  France | 2,148 | Sunk | |
| 3 May 1918 | Pancras | United Kingdom | 4,436 | Damaged | |
| 11 May 1918 | Sant Anna | 9,350 | Sunk | ||
| 12 May 1918 | Vimeira | United Kingdom | 5,884 | Sunk | |
| 16 May 1918 | Marie Frederique | 245 | Sunk | ||
| 13 July 1918 | Ponta Delgada | Portugal | 3,381 | Sunk | |
| 19 July 1918 | Australien | France | 6,377 | Sunk | |
| 19 July 1918 | Polperro | United Kingdom | 3,365 | Damaged | |
| 4 September 1918 | Arum | United Kingdom | 3,681 | Sunk | |
| 23 September 1918 | Edlington | United Kingdom | 3,864 | Sunk |