EntityQ3551961· pop 9· linked from 146 articlesU-1231Sign in to saveGerman World War II submarineConnectionsType IX submarineEntitycaptainEntitymotor-generatorEntityOberleutnant zur SeeEntityWorld War IIConceptHamburgEntityRigaEntityNazi GermanyConceptInternational Standard Book NumberEntityBergenEntityKielEntitysubmarineEntityFlensburgEntitytonneEntityLiepājaEntitytorpedoEntityknotEntitynautical mileEntitydiesel engineEntitypropellerEntityCategories1943 shipsCold War submarines of the Soviet UnionForeign submarines of the Soviet NavyGerman Type IX submarinesShip infoboxes without an imageShips built in HamburgU-boats commissioned in 1944World War II submarines of Germany