MON North Korea says it launched new ‘tactical nuclear attack’ submarine. South Korea doubts it works https://edition.cnn.com/2023/09/07/asia/north-korea-submarine-intl/index.html North Korea says it launched new 'tactical nuclear attack' submarine. South Korea doubts it works | CNN Seoul, South Korea CNN — North Korea claims to have launched a new “Korean-style” tactical nuclear attack submarin..