 He directed a radio communications service with England using secret codes based on the Swahili and Lingala languages.He became a leader in the escape service known as the Comet line, a network of clandestine cells that assisted Allied soldiers and downed airmen to escape from German occupied Belgium to unoccupied areas in France, Spain (Gibraltar) and Portugal.He participated with several such cells such as ABC, LLL, "Portemine" and organized "Benoît".