text:  Four of the German Imperial Navy boats — <unk> @-@ 3 , <unk> @-@ 7 , <unk> @-@ 8 , and <unk> @-@ 14 — were selected for service with the Constantinople Flotilla . All were sent to Pola for assembly and trials there as part of the Pola Flotilla before sailing on to join the Constantinople Flotilla . <unk> @-@ 3 disappeared en route to Constantinople in May 1915 , but the other three arrived there by mid @-@ June . 
  