SM UB-109 was a German Type UB III submarine or U-boat in the German Imperial Navy () during World War I. She was commissioned into the German Imperial Navy on 31 December 1917 as SM UB-109.
UB-109 was sunk by mine in the English Channel on 29 August 1918 and underwater scanning of the area covered by the Dover Barrage shows her wreck broken in half.
Construction
She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 7 July 1917. UB-109 was commissioned later the same year under the command of Oblt.z.S. Kurt Ramien. Like all Type UB III submarines, UB-109 carried 10 torpedoes and was armed with a deck gun. UB-109 would carry a crew of up to 3 officer and 31 men and had a cruising range of . UB-109 had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.
Summary of raiding history DateNameNationalityTonnageTonnages are in gross register tonsFate9 April 1918President Leroy-lallier1,320Sunk10 April 1918Henley3,249Sunk13 April 1918Wilson110Sunk18 April 1918Runswick3,060Sunk19 August 1918Zinal4,037Sunk25 August 1918Pontet Canet1,183Sunk26 August 1918Helge1,133Sunk
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Bibliography
External links Scott, G (2015) 'UB-109 off Folkestone, Kent: Archaeological Report', Wessex Archaeology Historic England project to research First World War submarines