This information is moot. The game is not one of bunkers but one of missiles of the type that were lobbed over the heads of millions of Japanese.
Who really cares if the NK leadership run scared into a doomsday spiderhole? If the weapons are out of the equation, the "coo-coo for cocoa puffs" leaders are completely impotent and can be ignored until their food, water and air runs out.
Right type of missiles in a open area create far less problem than ones in a underground fortified installation which outsiders may not detect.