Essentially, without improving that significantly, we don't know who's in our waters. We might be able to get some of that information from some of our allies if they're there, but if we don't have our own submarines there, we don't have a good understanding of what's happening within our coastal waters.
Given the modernization of the Russian forces in particular, they have sophisticated new submarine capability that I think can pose a significant threat to both Canada and wider North American interests.