The way we track submarines starts well before they are anywhere close to Canada. We try to keep an eye through imagery and other means if they are in port, and that's usually even something like Google Earth. You can probably find something like that. Once they move, then we try to track where they go. In terms of our situational awareness of where the submarines are, we have a fair idea of where that goes. Of course, the right to innocent passage for submarines, for any vessels that are on the surface, is not the issue at play here. I think what you actually mean are submarines that would be submerged to do that.
With our allies, there are capabilities to track some trigger points in the oceans where submarines cross. In terms of being able to say where those are and how the technology works, it would be a bit difficult to do here.