As for the issue of a submarine being in Canadian internal waters, if an incident occurs—and this is a question best answered, actually, by the commander of Canada Command—the way we would probably find it is by visual detection of a conning tower coming up, most likely, and we would then send out a team to investigate. That's the reaction we would follow, and then we'd see if we could determine if it was an ally or not.
On March 11th, 2009. See this statement in context.