german submarine german submarine type boat nazi_germany kriegsmarine world war ordered kriegsmarine german naval program keel laid bremen november following half months construction launched formally commissioned kriegsmarine august short career sinking enemy vessel damaging war patrol middle patrol posted missing north coast ireland november presumed sunk minefield laid days prior arrival area construction design construction ordered kriegsmarine violation treaty versailles keel laid november bremen yard number launched commissioned august year command design german type submarines slightly larger original german type submarines later designated displacement tonnes long tons surface tonnes long tons submerged boat total length pressure hull length beam height draught submarine powered man stroke cylinder diesel engines producing total metric horsepower shp use surfaced double acting electric motors producing total metric horsepower shp use submerged shafts propellers boat capable operating depths metres submarine maximum surface speed knots mph maximum submerged speed knots mph submerged boat operate nautical miles knots mph surfaced travel nautical miles knots mph fitted torpedo tubes fitted bow stern torpedoes naval gun rounds anti aircraft gun boat complement service history short career sank enemy vessel damaged war patrol north_sea northern coast ireland great_britain went sea war patrol november period days north_sea eventually northern coast scotland ireland search allied convoys heading great_britain time attacked enemy vessels sinking damaging november torpedoed sank british merchant vessel diplomat convoy loss crew merchant vessel british motor tanker convoy survived attack day went missing north neutral ireland presumed sunk minefield laid november days prior disappearance crew presumed dead summary raiding history
German submarine U-104 (1940)