 In 1918 four of the surviving German boats were converted into coastal minelayers . Of the seventeen boats in German service , two were sold to Austria @-@ Hungary , one was sold to Bulgaria , and nine were lost during the war . One of the five Austro @-@ Hungarian boats was sunk and another mined and not repaired . The five surviving German boats , the four surviving Austro @-@ Hungarian boats , and the Bulgarian boat were all turned over to the Allies after the end of the war and were broken up . 
 In 1918 four of the surviving German boats <a href='uninflect' title='1'><mark>were</mark></a> converted into coastal minelayers . Of the seventeen boats in German service , two <a href='uninflect' title='2'><mark>were</mark></a> sold to Austria @-@ Hungary , one was sold to Bulgaria , and nine <a href='uninflect' title='3'><mark>were</mark></a> lost during the war . One of the five Austro @-@ Hungarian boats was sunk and another mined and not repaired . The five surviving German boats , the four surviving Austro @-@ Hungarian boats , and the Bulgarian boat <a href='uninflect' title='4'><mark>were</mark></a> all turned over to the Allies after the end of the war and <a href='uninflect' title='5'><mark>were</mark></a> broken up . 
In 1918 4 of the surviving German boats was converted into coastal minelayers . Of the seventeen boats in German service , 2 was sold to Austria @-@ Hungary , one was sold to Bulgaria , and nine was lost during the war . One of da five Austro @-@ Hungarian boats was sunk and another mined and not repaired . The five surviving German boats , the fou4rviving Austro @-@ Hungarian boats , and the Bulgarian boat was alll turned over to the Allies after the end of tdawar and was broken up .