to bk101 , both im sure they must have a underground infrastructure how much of it we can detect i dont know ,however its interesting to know the latest tunnel was only found after a defector told the south about it. (but that was 20 years ago technology have improved alot since ) however i believe they may have other tunnels or be planning other tunnels and an underground infrastructure in the north. We know they have an underground infrastructure (see a guide to north korea ) we just dont know what extent or how well fortified.
to cof
i dont think the north has superior tactics they lack the ability for complex maneuvers
im going to explain a couple of military doctrines the last one is my weakness to any DA's please edit my post if ive got it wrong.
BLITZKRIEG
relies on force concentration (lots of tanks and mechanized /motorized supporting units)
uses spearheads or focal points)
also a key factor is air superiority and close air support
also requires good communications to move units about in good cohesion
also requires good supply system to maintain and good terrain for rapid mobility
INFILTRATION
relies on light infantry assaults infiltrating and encircling strong points
then heavier units finish of the strong points ( in north koreas case the elite or armoured units)
uses alot of artillery support
DEFENCE IN DEPTH
uses an elastic frontline with a large amount of reserves
when the frontline is penetrated the enemy are allowed to penetrate to an extent before the reserves drive the enemy back (useful when you have a large amount of forces)
NETWORK ENABLED CAPABILITY (practically the same as network centric warfare)
the british version of
uses use of c4istar to make sure that you have enough forces in the right place but not to much forces in british terms just enough just in time ( army says never gets their in time
)
basically highly advanced network centric maneuver warfare and co ordination between all branches with an increased awereness of the battlespace
also technology isnt everything
like i said the will to fight and military culture are the most important issues
from what ive gathered the south has a poor military culture and a reliance on the united states.
the north has either low moral according to robert kaplan or fanatical moral due the indoctrination .
however the technological gap may be to great.