SM UB-73  SM "UB-73" 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 2 October 1917 as SM "UB-73". "UB-73" was serving in the Mediterranean. On 21 November 1918 she was surrendered to France as required by the regulations of the Armistice with Germany. "UB-72" was ordered by the GIN on 23 September 1916. She was built by AG Vulcan of Hamburg and following just under a year of construction, launched at Hamburg on 11 August 1917. "UB-73" was commissioned later that same year . Like all Type UB III submarines, "UB-73" carried 10 torpedoes and was armed with a deck gun. "UB-73" would carry a crew of up to 3 officer and 31 men and had a cruising range of . "UB-73" had a displacement of while surfaced and when submerged. Her engines enabled her to travel at when surfaced and when submerged.