type submarine boat german_imperial_navy german kaiserliche_marine world war laid february final boat class german und sold germany class november submarine ordered boats class outbreak world war august austro hungarian navy convinced submarines class delivered adriatic gibraltar consequence entire class including sold german_imperial_navy november german control class known type boats renumbered redesigned reconstructed german specifications launched july commissioned september completed displaced tonnes long tons surfaced tonnes long tons submerged boat metres long armed torpedo tubes deck gun 4th flotilla war sank merchant ships combined gross register grt included total grt largest ships war sunk boat sunk june addition sank british flower class sloop damaged merchant ships grt november days armistice surrendered british broken design construction austro hungarian navy evaluated foreign submarine designs selected design known type new class submarines navy ordered boats february class seen improved version class design designed boats displace tonnes long tons surface tonnes long tons submerged doubled boats metres long overall beam metres draft metres austrian specifications called shafts twin diesel engines metric horsepower total surface running knots mph twin electric motors metric horsepower shp total maximum knots mph submerged boats designed torpedo tubes located bow stern boats armament include single deck gun laid february final boat class begun construction slated complete months sister boats complete world war began august boats construction kiel austrians convinced impossible delivery boats need towed mediterranean past gibraltar british territory result sisters sold imperial_german_navy november renumbered germans class redesignated type imperial_german_navy submarines redesigned reconstructed german standards increased surface displacement tonnes long tons submerged tonnes long tons torpedo load increased deck gun upgraded gun originally specified early career launched july september commissioned german_imperial_navy command second boat command year old officer commanded august week assignment january escorted german blockade runner marie north_sea february assigned german remained duration war served escort late february accompanied german merchant second german offensive germany began second submarine offensive shipping february month joined submarine offensive boats sent independently scotland patrol western entrance english channel sank ship march dispatched british sailing vessel nautical miles northwest west day damaged british cargo ship route load wheat galveston texas rest march early april sank additional ships gross register tons grt largest british cargo vessel carrying load hay new_brunswick torpedoed sunk march near end april admiral new commander chief high_seas_fleet 4th flotilla operated called merchant shipping offensive ordered boats sea return boats port remain grand_fleet ambush mid completed plans draw german high seas fleet sortie raid british fleet nests submarines fields boats sea beginning scout central north_sea signs british fleet completing days scouting sister boat took position boats stationed position attack british fleet leaving scapa_flow boats remain station june await coded message report sailing british fleet unfortunately germans british admiralty intelligence reports departure submarines coupled absence attacks shipping aroused british suspicions delayed departure german fleet sortie failure boats receive coded message warning british advance caused anticipated ambush complete disappointing failure received advance warning coded message crew fleet failure submarine ambush sink british capital ships allowed grand fleet engage numerically inferior high seas fleet battle jutland took place june success came december sank ton british steamer december month sank additional ships grt submarine warfare early stages war british blockaded germany preventing neutral shipping reaching german ports time called winter blockade severely limited imports food fuel germany results increase infant mortality deaths attributed starvation war blockade having dire consequences personally approved resumption submarine warfare begin february help force british peace new rules engagement specified ship left afloat recorded action new rules engagement occurred near end february boat shelled british grt tanker encountered survived attack march sank ships totaling tons damaged thirteenth tons month april german boats succeeded sinking tons allied neutral shipping total month world wars contribution came form ships tons sent day april monthly total sunk boats peaked april losses tons june contribute tally commanding officer awarded began productive month june sinking american line ocean liner june grt largest ship sunk largest ships sunk war boat carrying general cargo liverpool philadelphia sank position nautical miles rest june sank seven ships totaling tons june sank ships rest war british flower class sloop constructed purpose built ship warship disguised merchant ship lure german submarines range concealed gun batteries sloop patrolling struck single torpedo captain lieutenant commander aftermath explosion instead ordering away panic party draw submarine range ordered complete evacuation ship carried great confusion approached burning ship observed chaotic evacuation seizing petty officer revealed ship true identity shelled wreck escaped coming fire capsized sank following morning loss men killed explosion drowned evacuation rest crew heavily criticized conduct fire admiralty board total sank ships combined damaged war patrols surrendered british november days armistice broken summary raiding history
SM U-70