True. But they're stealth enough, can operate with a snorkel without completely surfacing and modern li-ion battery tech allows them to operate underwater for w

True. But they're stealth enough, can operate with a snorkel without completely surfacing and modern li-ion battery tech allows them to operate underwater for weeks. https://www.popularmechanics.com/military/navy-ships/a28184939/29ss-japan-submarine/ https://www.popularmechanics.com/military/navy-ships/a281849...