type submarine boat built operated german_imperial_navy german kaiserliche_marine world war operated mediterranean sunk november 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 commissioned patrols month career sank ships gross register tons grt early november departing base bulgaria boat struck sank rapidly men board killed attack crewmen rescued later died injuries wreck located raised 1930s eye rebuilding submarine engineers determined restoration submarine feasible accomplished remains recovered wreck buried funeral procession town november 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 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 service career commissioned german_imperial_navy command second 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 mid july success occurred days sank virginia sunk 16th carrying salt destined calcutta men board ton british ship lost went nautical miles days later french ship sunk nautical miles southwest ton largest victim germany conquest romania provided german_imperial_navy sufficient fuel oil submarines operate 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 accounted black_sea august sank ton italian steamer imperial_russian_navy use transport ship time days later boat torpedoed ton russian transport nautical miles ship sunk november departing bulgaria escort bulgarian torpedo boat cleared path russian mines thought edge minefield swung port directly second minefield laid russian forces night horn exploded control room engine room force break boat half sank rapidly survivors men conning tower deck injured men board perished attack survivors died severity wounds following day conceived plan search wreck intent raising restoration training vessel recover sunken boat centimeter deck gun additional consideration recovery remains crew july year search bulgarian discovered location wreck resting position near bulgarian romanian border wreck raised operation cost times cost new centimeter gun remains recovered buried february cemetery procession town engineers german builder inspected hulk determined repair wreck feasible restoration submarine operating condition training vessel military cost million dollars significantly million comparable new submarine cost ultimately opted order new submarines germany repair deck gun reused boat diesel engines restored operating condition training ship summary raiding history
SM UB-45