type submarine boat german_imperial_navy german kaiserliche_marine world war operated mediterranean sunk december ordered july laid shipyard bremen september little feet 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 commissioned june early december submarine fifth patrol struck black_sea short distance north entrance sank hands month career sank ships gross register tons grt 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 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 june service career commissioned german_imperial_navy june 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 month helm promoted august achieved success command japanese steamer sunk alexandria short destination week later boat sank greek sailing vessel headed adriatic egypt october torpedoed carrying hay took ship master prisoner gross register tons grt british steamer largest ship sunk 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 constantinople flotilla german der october german submarines black_sea accomplished little sinking ships august end year sank ships sent ton russian ship north november ship sunk early december based bulgaria fate december stern struck russian metres shore turkish village approximately kilometres north west entrance vessel entire complement reported perished sinking metres portion wreck comprising forward section torpedo room battery compartment located coal extraction operations salvaged turkish navy remainder vessel located display outdoor exhibit istanbul wreckage transferred remains vessel currently display ships sunk
SM UB-46