german type submarine boat german_imperial_navy german kaiserliche_marine world war submarine probably sunk british net april ordered october laid shipyard bremen november 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 march commissioned april spent entire career sank merchant ships half british fishing vessels march responsible sinking dutch ocean liner raising dutch public largest neutral vessel sunk war largest ships sunk boats april sunk hands 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 initial seven submarines numbered ordered october shy months planning class began laid bremen november 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 february sections shipped antwerp assembly typically week process assembled launched march loaded barge taken canals underwent trials early career submarine commissioned german_imperial_navy april command year old time boat commander april 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 submarines sank tons merchant vessels june ship sunk contributed seventh total british steamer listed gross register tons grt headed load coal torpedoed nautical miles east man lost life attack ship sunk june july sank british fishing vessels patrolling nautical miles sunken ships sailing vessels traditionally rigged red sails stopped boarded crewmen sunk explosives response american demands german submarines sunk line steamer high profile august september chief admiral issued orders offensive september directive ordered boats south western approaches required submarine activity north_sea conducted strictly prize regulations february command replaced december captured belgian ship named retained prize details taken final disposition ships captured prizes flanders boats sailed prize crews second submarine offensive early british blockade germany beginning effect germany imports royal_navy stopped seized cargo destined germany quantity cargo sunk german boats submarine offensive result german_imperial_navy began second offensive merchant shipping february final ground rules agreed enemy vessels germany self proclaimed war zone destroyed warning enemy vessels outside war zone destroyed armed avoid united_states enemy passenger attacked regardless war zone day beginning second offensive sank fishing northeast ships boarded sunk manner sunk previous july shortly transferred command early march replaced command preceding month shortly march torpedo struck starboard neutral dutch ocean liner anchor near nautical miles dutch coast dutch lloyd ship fully illuminated spelled electric lights twin funnels distress calls passengers crew rescued nearby ships ship largest neutral ship sunk war largest ships sunk boats germany initially tried british mines torpedoes relented confronted evidence torpedoes assigned sunk germans presented forged log showed near time attack reported fired specific torpedo british warship march days sunk previous commander minister netherlands writing fighting peace called explanation amazing derided certain boat fired particular torpedo british war vessel north_sea days sunk shot missed mark naughty little torpedo went cruising sea hook days waiting chance kill somebody came wandering torpedo promptly ran ship sank explanation germany blame dutch public furious believed hostile german act caused german diplomats spread rumors impending british invasion netherlands divert unwanted attention amidst diplomatic sinking continued sink ships march sank norwegian steamer grt ship carrying load destined went days later area sank danish ship ton sailing vessel ship sunk sinking evening april departed patrol mouth thames heard author book world war boat losses reports british deployed new explosive anti submarine net position early morning hours april suggests possible set contact mines net possible submarine struck british minefields flemish coast according authors book anchor cable british naval sea april depth charged good measure british destroyer deployed explosive sweeps submarine specific cause demise seventeen crewmen board submarine killed summary raiding history
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