EntityQ2495250· pop 7· linked from 90 articlesUD-5Sign in to save1941 O 21-class submarineConnectionsGerman invasion of the NetherlandsEntityUnited KingdomCountryWorld War IIConceptNazi GermanyConceptRotterdamEntityInternational Standard Book NumberEntityFreetownEntityBergenEntityKielEntitysubmarineEntityelectric motorEntityLorientEntityknotEntitynautical mileEntitydiesel engineEntityDen HelderEntityTorquayEntityKriegsmarineEntitygross register tonnageEntityGerman military administration in occupied France during World War IIEntityCategories1941 shipsMaritime incidents in May 1940Naval ships of the Netherlands captured by Germany during World War IIO 21-class submarinesSubmarines built by Rotterdamsche Droogdok MaatschappijWorld War II submarines of GermanyWorld War II submarines of the Netherlands