Any submarine is worrysome. But their fleet has very limited capabilities. While submerged on battery even the old Whiskey and Romeo's are pretty darned quite, but at some point they have to run those diesels, and that's where they get caught. But they can raise a lot of hell and cause some headaches. But the South would deal with them, and God help the Norks if we got involved...it'd be a US submariners wet dream.
