Undated: Hydra Project: Note of Arrangements Between the Directorate, Royal Canadian Corps of Signals, Canadian Army, And the Directorate of Special Communications, Great Britain

The plans between the British Directorate of Special Communications and the Directorate of the Royal Canadian Corps of Signals, Canadian Army were indeed synchronized, and summarized in this document. This planning document underlines a requirement for a radio communication link between Canada and the United Kingdom to handle 150,000 groups a day (to be expanded to up to 400,000 groups a day). Traffic received from Canada in England was to be delivered to the Office of the Canadian High Commissioner, the Dominions Office, and the United Kingdom Foreign Office (both Diplomatic and Special branches), while traffic received in Canada was to be forwarded on to the Department of External Affairs in Ottawa, the CBNRC, the U.K. High Commissioner in Ottawa, the British Embassy in Washington, and the “British Foreign Office establishments in New York.” The requirement for this facility was to be fulfilled by the HYDRA station in Oshawa, Canada, and by the Diplomatic Wireless Station at Hanslope, near Bletchley Park in the U.K. “General management” and “technical policy” of the HYDRA communications circuit would require ongoing, direct communication between the Canadian army Director of Signals, and the Director of Special Communications in the U.K. While HYDRA was to be transferred to Canada on April 1, 1947, coordination with the British would continue.