The USS Ronald Reagan met its match in the form of a single, diesel-powered Swedish submarine. During war games, the plucky submarine was able to sneak through the passive sonar defenses of the Ronald Reagan and its entire accompanying group to score a few precious torpedo hits, (virtually) sinking the cruiser and getting away without so much as a scratch. While the virtual defeat was obviously concerning, the Navy leased a Gotland-class sub from the Swedes in order to figure out how to counter its unexpected stealth. And, of course, it’s unlikely we’ll be at real war with Sweden any time soon.
How a Single Swedish Submarine Defeated the US Navy