type submarine boat german_imperial_navy german kaiserliche_marine world war operated mediterranean war broken malta ordered july laid shipyard bremen september length displaced tonnes long tons depending surfaced submerged equipped carry complement torpedoes bow torpedo tubes deck gun group submarines selected mediterranean service broken sized components shipped assembled launched commissioned march patrols war sank ships gross register tons grt captured ton vessel prize damaged british class sloop october delivered gold help finance georgian independence movement surrender ottoman_empire late october fled surrendered november taken malta broken design construction german design improved design boats ordered september service boats found small slow major problem single propeller shaft engine combo component failed boat totally disabled flaw boats featured twin propeller shafts twin engines shaft engine increased boat speed new design included powerful batteries larger torpedo tubes deck gun boat carry twice torpedo load counterparts nearly times fuel contain changes hull larger surface submerged displacement double boats german_imperial_navy ordered july series boats numbered metres long metres single hull saddle tanks draught metres surfaced displaced tonnes long tons submerged tonnes long tons surface submarine equipped twin diesel engines twin electric motors surfaced submerged running respectively drove propeller shaft surface speed knots mph fast knots mph underwater boat carry tonnes long tons diesel fuel giving range nautical miles knots mph electric motors batteries provided range nautical miles knots mph submerged equipped centimeter bow torpedo tubes carry torpedoes boat armed deck gun laid september boats selected service mediterranean construction broken sized components shipped overland austro hungarian port shipyard workers assembled boat sisters launched march service career commissioned german_imperial_navy march command boat command assigned navy german flotilla based site main base boats flotilla operated austro hungarian base located farther south closer mediterranean german boats typically returned repairs months service proved unsuccessful boat sank ships germany conquest romania romania world war german_imperial_navy sufficient fuel oil submarines located black_sea sister ships ordered constantinople route navigate dardanelles heavily mined allies middle joined der august german submarines black_sea accomplished little sinking ships august end year sank half september october september achieved success sank russian transport black_sea ton ship headed torpedoed ton russian vessel sunk entrance october ton sunk weeks later april operating mediterranean attacks ships april torpedoed british class sloop hms nautical miles alexandria damaging vessel days later sank ton egyptian sailing ship week sank ton italian sailing vessel east rhodes succeeded commander year old previously commanded type boat led sink largest ship june ton line steamer use carrying troops horses sent nautical miles southeast crewmen died attack according splendid discipline embarked troops sole reason lost early october returned black_sea ordered deliver gold finance georgian independence movement remaining black_sea sank sailing ships october november november torpedoed ton anchor georgian coast shelled northern black_sea assumed command april week later led boat capturing motor sailing vessel prize weeks later september succeeded month stint commander led boat sinking final ship night september ton italian steamer sent south commanding officer changed twice end war submarine sank ships signing armistice october ended war ottoman_empire remaining boats constantinople flotilla fled surrendered november broken malta summary raiding history
SM UB-42