By the way, those submarines have to surface in two or three days. According to news reports, they cannot remain underwater for extended period of time. So lots of them could be detected in next day or two. Hopefully.
Considering that they are old and poorly maintained, some of them may break down during their mission. That would be interesting to watch. A broken NK submarine floating around near S. Korean shore caught by fishing trawlers.
That goofy little NORK despot not being room temperature is more proof that the CIA is not as potent as it use to be.