During a 2005 war game involving the U.S. and Swedish navies, a $100 million Gotland-class vessel proved itself capable of foiling an entire American carrier strike group (CSG) that included the $6 billion USS Ronald Reagan aircraft carrier alongside destroyers, helicopters, and submarines.
https://nationalinterest.org/blog/buzz/how-100-million-cheap-submarine-sank-6-billion-navy-aircraft-carrier-210874

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