Yes. I think you're correct in saying that they are beyond reach to just about anybody, but there are some people who are owners of and operate extreme depth machinery. One of them chose to dive down on the German battleship Bismarck and was very severely reprimanded by the German government for doing so. It's the same person who discovered the Titanic. There are people who have the equipment. They are not as common as the regular diver who is looking for souvenirs to show his grandchildren or something like that.
Yes, the warships that I'm concerned about and the sailors' remains there, are within the Canadian exclusive economic zone.