SM UB-3

SM UB-3

SM UB-3 was a German Type UB I submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She disappeared on her first patrol in May 1915, and was the first of her class to be lost.

UB-3 was ordered in October 1914 and was laid down at the Germaniawerft shipyard in Kiel in November. UB-3 was a little more than 92 feet (28 m) in length and displaced between 127 and 142 metric tons (140 and 157 short tons), depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. She was launched and commissioned as SM UB-3 in March 1915.

UB-3 was broken into sections and shipped by rail to the Austro-Hungarian port of Pola in April for reassembly. She officially joined the Pola Flotilla on 1 May and departed on her first patrol for temporary duty in Turkey on 23 May, and was never seen again. A postwar German study concluded that UB-3 was likely the victim of an unexplained technical problem in the absence of any minefields or enemy action.