Allow me to answer in English.
NORAD has, as Dr. Charron indicated, the maritime domain awareness issue. One of the issues we have is that the Russians and the Chinese have submarines carrying ballistic and cruise missiles. The submarines we intend to purchase for their ability to work under the ice will be capable of dealing with those types of platforms before they can pose a threat to North America.
One of the biggest problems NORAD faced when I was there was that we spent a lot of time chasing arrows but were unable to get to the archers. The submarines will give us the capability in wartime to deal with the archers, presumably and hopefully before they even let go the arrows. That's a huge capability.