german submarine german submarine type boat nazi_germany kriegsmarine world war ordered july keel laid bremen december following months construction launched september formally commissioned kriegsmarine december short career sank enemy vessels having left home port wilhelmshaven war patrol april intercepted allied aircraft seven days later coast norway invasion country sunk bomb aircraft crew men died escaped sinking submarine construction design construction ordered kriegsmarine july violation treaty versailles keel laid december bremen yard number launched september commissioned december 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 went sea april days north_sea search allied convoys heading norway support campaign centred country time encountered enemy vessels april eighth day patrol waters norway struck pound bomb british aircraft deck machine gun fire boat sank harbor crew went remaining able escape sinking vessel picked german mountain troops stationed ashore later formed crew
German submarine U-64 (1939)