SM UB-56
SM UB-56 was a German Type UB III submarine or U-boat in the German Imperial Navy during World War I. She was commissioned into the Flanders Flotilla of the German Imperial Navy on 19 July 1917 as SM UB-56.
She operated as part of the Flanders Flotilla based in Zeebrugge. UB-56 was sunk at 23:41 on 19 December 1917 at after striking a mine, 37 crew members lost their lives in the event.