SM UB-115
1917 Type UB III submarine
SM UB-115 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 28 May 1918 as SM UB-115. She was the only German submarine commissioned with the number 115.
UB-115 was sunk by British warships, including HMS Ouse and HMS Star, and the rigid airship R29 at 55°13′N 1°22′W using depth charges and aerial bombs.
Construction
She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 4 November 1917. UB-115 was commissioned in the spring the next year under the command of Oblt.z.S. Reinhold Thomsen. Like all Type UB III submarines, UB-115 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-115 would carry a crew of up to 3 officers and 31 men and had a cruising range of 7,420 nautical miles (13,740 km; 8,540 mi). UB-115 had a displacement of 519 t (511 long tons) while surfaced and 649 t (639 long tons) when submerged. Her engines enabled her to travel at 13.3 knots (24.6 km/h; 15.3 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.
Fate
On 29 September 1918 while under the command of Reinhold Thomsen, UB-115 was engaged by armed trawlers (amongst others Viola), the airship R29, HMS Ouse and HMS Star.
This brief starts where responsible research should: with the source description of “SM UB-115” as 1917 Type UB III submarine. Everything that follows is an evidence route, not borrowed authority.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jan 16, 2026. The linked authority identifier is Q7391620. Authority coordinates are 55.217, -1.367. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1918 and 1917.
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