I'll answer that really quickly and turn to my colleague.
I'm happy you brought up the bomber aspect. We have something we can do in response to the bombers coming close to Canadian territorial or sovereign space. What do you have in your tool box right now to address the submarine that's passing through the north that you may not be aware of? There is nothing.
What would you do? I think to start with, there would be diplomatic elements and different kinds of pieces that would come into play, but beyond that, what could you do from a military perspective? Probably not much. If it has under-ice capability, it could stay under ice for as long as it wanted.