Broadcasts from the Netherlands were interrupted by the German invasion in May 1940. Startz and PCJ broadcast the events of the invasion for four days until he was arrested. Startz and the staff of PCJ blew up the powerful PCJ transmitters in hopes of preventing them from being used by the Nazis. While the Germans used forced labour to rebuild the transmitter and use it for radio propaganda, Startz dropped out of broadcasting for the remainder of the war. PCJ resumed broadcasting in 1946, including Startz and Happy Station which, in 1947, transferred to the new Radio Netherlands Worldwide when PCJ was nationalized.