German espionage activity in Cuba was minor, despite the country's importance to the Allied war-effort, and was eliminated by Allied counter-intelligence forces before it could become an effective part of the Bolívar network. To establish a clandestine radio station in Cuba, the Abwehr sent Heinz Lüning to Havana. Lüning, however, was an incompetent spy because he failed to master the very basics of espionage. For example, he was never able to get his radio working correctly, he did not understand how to use the secret ink he was supplied with, and he missed drop boxes. In spite of his lack of competence, after his premature arrest in August 1942, Allied officials, including President Fulgencio Batista, General Manuel Benítez, J. Edgar Hoover, and Nelson Rockefeller, attempted to fabricate a link between Lüning and the German submarines operating in the Caribbean, claiming that he was in contact with them via radio, to provide the public with an explanation for their failures early in the U-boat campaign. Accordingly, Allied officials elevated Lüning's importance to that of a "master spy," but there is no evidence that he ever came across even a single piece of important information during his time in Cuba. Lüning was found guilty of espionage and executed in Cuba in November 1942, becoming the only German spy put to death in Latin America during World War II. The first of the clandestine information passed from Argentina to Germany concerned finances, the organization of the South American net, Argentine politics, and the establishment of a courier system between Argentina and Spain using crewmen aboard Spanish merchant vessels. Once the network got into full operation, traffic volume increased to as much as fifteen messages a day. However, in January 1944, the Argentine government arrested several German and Spanish agents, and Becker and Franczok were forced into hiding. Communications between Argentina and Germany were interrupted for about a month, and when communications were reestablished, Becker asked Berlin for radio equipment, money, and secret ink materials. This request resulted in Operation Jolle, which, eventually, turned into a mission not only to resupply Becker's network in South America, but to establish additional clandestine radio stations in Mexico, the United States, and Central America, which would pass information back to Germany via the South American network. The plan was to have two agents named Hansen ("Cojiba") and Schroell ("Valiente") deliver the supplies to Buenos Aires via ship, and then make their way into Mexico, where they would build a transmitter for communicating with the control station in Argentina.