Soviet Intelligence Service was trying to restore the interrupted communication during the whole time of the war. Since 1942, the Intelligence Centre nearby Moscow trained namely two-membered air-drops (resident and radio operator) equipped with agency radio stations of TENSOR, SEVER and NABLA type. The GRU and NKVD air-drops were sent to the Protectorate insufficiently prepared very often to the addressees of already arrested mediators and with the document elaborated according to the instructions sent in the radio counter-games organized by Gestapo so that they could be quickly identified by any Police control as Soviet paratroopers. Some individuals became informer of Gestapo. The radio counter-games helped to misrepresent Soviet Intelligence Service and to neutralize a number of air-drops shortly after their jump. At least 30 air-drops participated by 60 Czechoslovak citizens were executed without permission of the Czechoslovak Military Mission in the U.S.S.R. till the end of the year 1943. After many disappointments, the success arrived as late as March 1943 when the air-drop of Vetiška and Klein crossed Poland and established contacts with illegal leadership of Communist Party of Czechoslovakia. Other air-drop of Procházka and Vohradník sent with the same task was also successful.