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Originally Posted by Elektroniikka-Asentaja
I was amazed because of two reasons
1. I never thought that Sweden would have invested in such submarine technology
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Besides small coastal patrol craft subs are what Sweden invests in. Subs are their main naval weapon.
Quote:
2. Submarine that can stay submerged for a month, is able to sink an aircraft carrier with one or two hits and is able to play cat and mouse in San Diego military harbor without getting caught 
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Not that surprising. As HB said nucs can stay dived for months too, and don't have the same speed restrictions that an AIP boat does and AIP boats need to run loud turbines or modified diesels to charge the batts.
Also any decent sub can sink a carrier with a torpedo spread. I know a guy who was in the USN and was chopped for wargames to a South American (forgot what country) Type 209 submarine that waited on the bottom for a US carrier to drive within torpedo range and scored a "kill". The Type 209 is no AIP boat.