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From Victoria a submarine has a 3,402.9NM journey to get to Canada’s arctic border let alone start a patrol.
From Halifax, a submarine has a 2,500NM journey to get to the Eastern edge of the NWP
To me Canada has two viable options for submarines, joining AUKUS for those type SSN, getting a bunch of uncrewed patrol “submarines” to conduct under ice patrols in conjunction with the P-8A’s and a Mother Ship.
Given the way Canada seems to look at Nuclear Power these days, maybe the uncrewed method is for the best.