There is something even more silent prowling (occasionally) the high seas: https://www.popularmechanics.com/military/navy-ships/a19784775/gotland-class-sub-ron

There is something even more silent prowling (occasionally) the high seas: https://www.popularmechanics.com/military/navy-ships/a19784775/gotland-class-sub-ronald-reagan-war-games/ https://www.popularmechanics.com/military/navy-ships/a197847...