german type submarine boat german_imperial_navy german kaiserliche_marine world war submarine disappeared patrol march ordered november laid shipyard bremen february little metres length displaced tonnes long tons depending surfaced submerged carried torpedoes bow torpedo tubes armed deck mounted machine gun broken sections shipped rail antwerp launched april commissioned spent entire career sank ships british fishing vessels captured ships prizes damaged tanker march departed patrol seen suggestions fate match boat operation details july found england east coast near county suffolk archaeologists design construction german_army rapid advance north_sea coast earliest stages world war german_imperial_navy found suitable submarines operated narrow shallow seas flanders project design effort begun mid august produced type design small submarine shipped rail port operations quickly assembled constrained railroad size limitations design called boat metres long displacing tonnes long tons torpedo tubes sister boat comprised order submarines ordered november little months planning class began laid bremen february built metres long metres draft metres single brake horsepower cylinder diesel engine surface travel single shaft horsepower electric motor underwater travel attached single propeller shaft speeds knots mph surfaced knots mph submerged moderate speeds sail nautical miles surface nautical miles submerged batteries like boats class rated diving depth metres completely seconds armed centimeter torpedoes bow torpedo tubes outfitted single millimeter machine gun deck standard complement consisted officer thirteen enlisted men work complete yard rail shipment process shipping boat involved breaking submarine essentially knock kit boat broken approximately pieces loaded railway early sections shipped antwerp assembly typically week process assembled launched april loaded barge taken canals underwent trials early career submarine commissioned german_imperial_navy command year old joined flanders flotilla german des organized march joined flotilla germany midst submarine offensive begun february campaign enemy vessels german defined war zone german encompassed waters united_kingdom sunk vessels neutral countries attacked definitively identified enemy vessels operating false flag july torpedoed british tanker lighthouse despite loss men crew able beach ship listed gross register tons grt early month august sank british fishing vessels patrolling area sunken ships sailing vessels traditionally rigged red sails stopped boarded crewmen sunk explosives august chief admiral issued orders offensive response american demands german submarines sunk line steamer high profile august september directive ordered boats south western approaches required submarine activity north_sea conducted strictly prize regulations days later seized belgian sailing vessel prize enemy naval targets subject prize regulations september torpedoed sank saint french_navy survivor ton ship eighteen man crew months later ton french fishing ship jesus maria destroyer launched torpedo struck ship killed men jesus maria crew january area sank additional fishing ships british belgian day war journal german records ton british steamer knock british records list cargo ship sunk bombs ship sunk command february relieved month week month resumed command april meantime germany begun second submarine offensive merchant shipping end february reaction british blockade germany early british blockade having effect germany imports royal_navy stopped seized cargo destined germany quantity cargo sunk german boats submarine offensive sank ships offensive called near end april admiral commander chief high_seas_fleet grand_fleet ambush attempts mid completed plans draw german high seas fleet sortie raid british fleet nests submarines fields support operation flanders boats set midnight form line nautical miles east group intercept attack british light forces sortie north join battle unfortunately germans british admiralty intelligence reports departure submarines coupled absence attacks shipping aroused british suspicions delayed departure german high seas fleet sortie failure boats stationed north receive coded message warning british advance caused anticipated ambush complete disappointing failure group sighted forces far away mount attack failure submarine ambush sink british capital ships allowed grand fleet engage numerically inferior high seas fleet battle jutland took place june left good june succeeded commanded boat weeks followed commanded boat july december leadership added ship tally captured sank dutch ship september ton steamer route london cargo piece goods sunk nautical miles mass success capture norwegian steamer area command taken command december success months conversion sister boats converted submarines conversion involved removing bow section containing pair torpedo tubes boat replacing new bow containing capable carrying mines process boats lengthened feet displacement increased tonnes long tons surface tonnes long tons surface exactly conversion performed reported dockyard november january possible converted remained command kaiser personally approved resumption submarine warfare begin february help force british peace new rules engagement specified ship left afloat contribute effort december captured sank single fishing direction january replaced sinking march led patrol boat seen postwar account tells british bombed boat north_sea march according author account provides details support claim account attributes sinking british destroyer february south portland pointing port date german postwar study rejected british claim destroyers sank march position didn depart minutes attack took place specific cause demise eighteen crewmen board submarine killed discovery july archaeologists found remains submarines including united_kingdom southern east coasts near county suffolk find vessels german_imperial_navy dating world war der reported divers located german boats english submarines found depths feet england southern eastern coasts ships sunk damaged
SM UB-17