Uhh...North Korea is not opening up to the west. Where'd you get that idea?
As for the diving, I know that the further north you go on the east coast of South korea (jeez that's a lot of direction words), the better the coral growth. There are less factories near the border for obvious reasons so less pollution and cleaner water. This time of year, there will be lots of really tall kelp but unfortunately, not a lot of fish. It's good for korea, but not good when you compare to other places in Asia. I'm headed up there in a couple weeks actually. I can only assume the diving on the N Korean side is similar but colder. Maybe it would mean less plankton and better vis?
Either way, I'd doubt it if you'll see Kim Jung Il dive charters up there anytime soon. Who knows? Maybe Padi will come out with an evil tyrant dictator specialty and we can head up there to get our cards.
