A 3,000-ton sub capable of firing it. on the peninsula, it's clears there's arms racing dynamics going on. north korea is signaling its missile arsenal is moving to sea so south korea is doing the same. that means that both countries will in a crisis be looking in many different directions. that increases the risk of miscalculation and increases the risk that an accident could occur. >> reporter: the blur of activity on the peninsula in recent weeks includes a bizarre parade through kim il song square in pyongyang. a k9 unit, horses, and at the stroke of midnight, an image that got north korea...