SM UB-73

SM UB-73 was a German Type UB III submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) 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.

Construction
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 8.8 cm deck gun. UB-73 would carry a crew of up to 3 officer and 31 men and had a cruising range of 8420 nmi. UB-73 had a displacement of 508 t while surfaced and 639 t when submerged. Her engines enabled her to travel at 13.4 kn when surfaced and 7.5 kn when submerged.