more dangerous than intercontinental ballistic missiles like the one north korea launched back in march, submarine can sneak up to enemy shores whether it be south korea or japan where u.s. has a major military presence and fire this missile and travels at very low altitude. this particular missile never reaching an altitude higher than 40 miles and yet it traveled almost 400 miles. that means it could literally fly in under the radar and be all but impossible for existing weapons systems to shoot down if there was even enough advanced warning. that s why this is concerning even though we should point out north korean submarines are older diesel technology, not like the u.s. silent nuclear submarine fleet. the fact that they re perfecting and demonstrating this technology is certainly concerning for the south koreans, americans and japanese and much of the world but particularly this region. moon jae-in convened national security council where they strongly condemned this launch