30 January 1968: Closure of Oshawa Transmitting Station

But it would not be business as usual for at least one part of the HYDRA network. This letter from Col. Finch announces the National Defence decision to close the HYDRA transmitting station at Oshawa. This would require approval by External Affairs (reference is made to a memo at flyleaf for signature – not included) – as they are responsible for “policy aspects” at Rockcliffe, as they had been responsible for policy aspects at Leitrim. While External Affairs would lose one radio channel to the U.K., they would still have use of a transatlantic cable and a radioteleprinter channel and thus would have “no case to complain about withdrawal of the radio channel.” 

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Fixed Communications - Hydra Telegraph Relay System - Relocation of Hydra - Plans and Policy, RG24, S-2723-2, Vol. 2, Library and Archives Canada (LAC)