SM UB-109
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.