SM U-16 (Austria-Hungary)

SM U-16 or U-XVI was a U-10-class submarine or U-boat of the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u. K. Kriegsmarine) during World War I. U-16 was constructed in Germany and shipped by rail to Pola where she was assembled and completed in September 1915. She was commissioned in October 1915.

For most of her career, U-16 operated in the Adriatic out of Kotor patrolling off the Albanian coast. The U-boat sank one small sailing ship in November and seized another in December. U-16 carried Field Marshal Svetozar Borojević of the Austro-Hungarian Army as an observer while performing diving tests after engine repairs in January 1916. A water leak in March flooded U-16's batteries and put the U-boat out of action for about six weeks of repairs. While operating off Vlorë in mid-October 1916, U-16 sank an Italian destroyer acting as a convoy escort. U-16 was sunk in the ensuing action, but sources are not clear on the exact cause of her sinking. In all U-16 sank or captured three ships with a combined tonnage of 417. She was the only U-10-class submarine sunk during the war.