How many torpedoes do these boats carry? they need not go far to cause a great deal of problems for a trading nation like South Korea. If they can launch even primitive rockets they could menace a wide range of targets—what about our base in Okinawa? Pusan Harbor? Just going missing is a threat. What ever they do—it will happen in the next 48 hours.
What sort of Damage could they do to the south?
What if the sub itself is the torpedo?