It was through the BSC that the British acquired the powerful "Aspidistra" transmitter that was used for propaganda by the Political Warfare Executive (PWE), BBC overseas broadcasts and by the Royal Air Force (RAF) in the war against Germany. BSC also sourced a transmitter for it to communicate with the UK which was operated under the code name "Hydra" at Camp X, BSC's Special Training School No. 103, a Second World War paramilitary installation in Whitby, Ontario for training covert agents in the methods of "secret warfare". The Hydra station was established in May 1942 by engineer Benjamin deForest Bayly; he also invented a very fast coding/decoding machine for telegraph transmissions labelled the Rockex. Camp X had been established in December 1941 by Stephenson to train Allied agents in methods of clandestine operations; many graduates would be dropped behind enemy lines in Europe by SOE.