german type submarine boat german_imperial_navy german kaiserliche_marine world war sank ships career broken germany ordered october laid shipyard kiel november little metres length displaced tonnes long tons depending surfaced submerged carried torpedoes bow torpedo tubes armed deck mounted machine gun launched commissioned february sailed join flanders flotilla member class shipped rail antwerp join unit flotilla sank british ships gross register tons grt command boat assigned march relegated training role december year end war deemed unable surrender rest germany boat fleet remained germany broken february design construction german_army rapid advance north_sea coast earliest stages world war german_imperial_navy found suitable submarines operated narrow shallow environment 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 submarines numbered ordered october shy months planning class began laid november boats class started launched kiel 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 service career submarine commissioned german_imperial_navy february command year old native underwent trials german home waters sailed germany flanders join flanders flotilla german des boat flotilla shipped antwerp rail joined flotilla germany midst submarine offensive begun february campaign enemy vessels german defined war zone german encompassed waters united_kingdom including english channel sunk vessels neutral countries attacked definitively identified enemy vessels operating false flag boats flanders flotilla initially limited patrols southern portion north_sea united_kingdom netherlands june patrolling area nautical miles southeast sank british fishing combined grt largest tons sailing vessels traditionally rigged red sails stopped boarded crewmen sunk explosives sister boat pioneered route past british anti submarine nets mines late june boats flotilla began patrol western english channel soon followed patrols channel boats sank ships successfully completing helped prove feasibility defeating british august patrolling area sank british tons largest vessel sunk date early following month sank fishing nautical miles east southeast ton ton days later sank ton boy nautical miles east vessels sunk june stopped sunk explosives germany submarine offensive suspended september chief admiral 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 sink vessels months german_imperial_navy began second submarine offensive february declaring provisions enemy vessels war zone destroyed warning february torpedoed sank cargo ship ultimately wartime success british steamer grt largest ship sunk went loss fourteen crew early march succeeded commander cadet class went command boats responsible sinking nearly tons shipping published memoir world war boat service boot und included overview career including time went command boats responsible sinking nearly tons shipping published memoir world war boat service boot und included overview career including time early february beginning receive newer larger type boats transferred german der week took command boats baltic flotilla based kiel danzig stationed time reported sources succeeded april turn succeeded july early december reassigned transferred training duties according authors submarines assigned training duties war worn craft unfit service end war allies required german boats sailed surrender boats deemed allowed remain germany broken february summary raiding history
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