| abstract | - SM U-31 or U-XXXI was a U-27 class U-boat or submarine for the Austro-Hungarian Navy. U-31, built by the Hungarian firm of Ganz Danubius at Fiume, was launched in March 1917 and commissioned in April. U-31 had a single hull and was just over in length. She displaced nearly when surfaced and over when submerged. Her two diesel engines moved her at up to on the surface, while her twin electric motors propelled her at up to while underwater. She was armed with two bow torpedo tubes and could carry a load of up to four torpedoes. She was also equipped with a deck gun and a machine gun. In October 1917, U-31 sank while in port at Porto Bergudi and was out of service through April 1918 while she was raised and repaired. During her service career, U-31 sank two ships and damaged one warship, sending a combined tonnage of to the bottom. U-31 was at Cattaro at war's end and was awarded to France as war reparation in 1920, towed to Bizerta and scrapped there.
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