 In July 1916 , the Germans sent SMS Breslau to mine off Novorossisk . To attempt to neutralize any Russian response , UB @-@ 7 — under the command of Hans <unk> , who had taken over for Werner when he returned to Germany to command the new U @-@ 55 — was stationed off Sevastopol to attack any ships that sailed in response to the mission . Unfortunately , Russian seaplanes spotted UB @-@ 7 and bombed the U @-@ boat , preventing her from accomplishing her goal . With the submarine out of the way , Rear Admiral Aleksandr Kolchak sortied with dreadnought Imperatritsa Mariya , cruiser <unk> , and five destroyers . The Russian fleet engaged Breslau , which was forced to abort her mission and retire . Sources are quiet on damage , if any , suffered by UB @-@ 7 . 
