It was crucial for the domestic resistance to maintain communication with the foreign resistance headquarters in London. This communication was initially maintained by radio stations in the connection program SPARTA. SPARTA I maintained regular connection from April 1940 to May 1941. Sergeant Jindrich Klecka was one of its operators. In March 1941 radio stations of the group „Three Kings“ also established a connection, reporting as SPARTA II. It was destroyed in June 1941. Subsequently, only another SPARTA I station operated by Jindrich Klecka maintained a connection with London. On October 3, 1941 he connected with London for the last time. Surrounded by the Gestapo, he shot himself shortly before midnight. Thanks to the SPARTA program, 16,000 dispatched were forwarded abroad.