type submarine boat german_imperial_navy german kaiserliche_marine world war operated mediterranean disappeared august ordered july laid shipyard bremen september metres length displaced tonnes long tons depending surfaced submerged equipped carry complement torpedoes bow torpedo tubes centimeter deck gun group submarines selected mediterranean service broken sized components shipped assembled launched april commissioned patrols month career sank ship gross register tons grt early august departed arrived fate officially unknown sunk torpedo boat near island august 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 imperial_german_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 bremen shipyard september boats selected service mediterranean construction broken sized components shipped overland austro hungarian port shipyard workers assembled boat sisters launched april service career commissioned german_imperial_navy command fourth 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 june achieved success sank steamer nautical miles southeast crete gross register ton british steamer carrying general cargo glasgow alexandria went loss men 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 departed august located gallipoli peninsula pick pilot trip dardanelles arrived fate unknown british post war reports list falling victim barrage july author points german records record departure days reports possible sunk torpedo boat hms reported newspaper sinking boat nautical miles august lance bomb summary raiding history
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