What we did was a pilot—this was about a decade ago—to see whether or not this would work. It was actually done by another government department, not by the Department of National Defence, which came with us into the north as part of Operation Nanook and put a cable under the water to see if the technology in itself would be successful.
To be fair, you can talk to the wisest person in the world—Mr. Google—and quickly find out that this exists today. It exists with our allies across the Atlantic, who know exactly what is coming across the Atlantic at any time, with a lot of detail and a lot of preciseness.