 UB @-@ 1 and the still incomplete UB @-@ 15 were sold to the Austria @-@ Hungary in February 1915 ; both were dismantled and shipped to Pola in May . After one cruise under the German flag , each boat was commissioned into the Austro @-@ Hungarian Navy . The pair — renamed U @-@ 10 and U @-@ 11 , respectively — were joined by U @-@ 15 , U @-@ 16 , and U @-@ 17 in October . Known as the U @-@ 10 or the Okarina ( English : Ocarina ) class as a part of the Austro @-@ Hungarian Navy , the five boats operated primarily in the Adriatic in patrols off Italy and Albania . U @-@ 10 ( ex UB @-@ 1 ) hit a mine in July 1918 and was beached , but had not been repaired by the end of the war . U @-@ 16 was sunk after she torpedoed an Italian destroyer in October 1916 , and the remaining three ( and the unrepaired U @-@ 10 ) were ceded to Italy at the end of the war . 
 UB @-@ 1 and the still incomplete UB @-@ 15 <a href='uninflect' title='1'><mark>were</mark></a> sold to the Austria @-@ Hungary in February 1915 ; both <a href='uninflect' title='2'><mark>were</mark></a> dismantled and shipped to Pola in May . After one cruise under the German flag , each boat was commissioned into the Austro @-@ Hungarian Navy . The pair — renamed U @-@ 10 and U @-@ 11 , respectively — <a href='uninflect' title='3'><mark>were</mark></a> joined by U @-@ 15 , U @-@ 16 , and U @-@ 17 in October . Known as the U @-@ 10 or the Okarina ( English : Ocarina ) class as a part of the Austro @-@ Hungarian Navy , the five boats operated primarily in the Adriatic in patrols off Italy and Albania . U @-@ 10 ( ex UB @-@ 1 ) hit a mine in July 1918 and was beached , but <a href='been_done' title='4'><mark>had</mark></a> not been repaired by the end of the war . U @-@ 16 was sunk after she torpedoed an Italian destroyer in October 1916 , and the remaining three ( and the unrepaired U @-@ 10 ) <a href='uninflect' title='5'><mark>were</mark></a> ceded to Italy at the end of the war . 
UB @-@ 1 and da still incomplete UB @-@ 15 was sold to tdaAustria @-@ Hungary in February 1915 ; both was dismantled and shipped to Pola in May . After one cruise under thdaerman flag , each boat was commissioned into thedastro @-@ Hungarian Navy . The dar — renamed U @-@ 10 and U @-@ 11 , respectively — was joined by U @-@ 15 , U @-@ 16 , and U @-@ 17 in October . Known as the U @-@ 10 or the Okarina ( English : Ocarina ) class as a part of the Adaro @-@ Hungarian Navy , the five boats operated primarily in the Addatic in patrols offf Italy and Albania . U @-@ 10 ( ex UB @-@ 1 ) hit a mine in July 1918 and was beached , but done not been repaired by the endda the war . U @-@ 16 was sunk after she torpedoed an Italian destroyer in October 1916 , and the remadang three ( and the unrepdaed U @-@ 10 ) was ceded to Italy at the end of the war . da