Korea. and traveled over 600 kilometer trajectory. i m joined by will ripley in taipei. yet another missile fired by north korea, real flurry of them this year. we re learning disturbing things about this one. what s the latest? reporter: yeah, kim. you just talked about the fact that the maximum altitude of this missile was only 60 kilometers. that s less than 40 miles. it could literally be launched from a submarine along the coastline of japan, of south korea hypothetically and would fly under the radar and be essentially impossible for existing missile defense systems to shoot down or certainly very difficult. and this is the kind of missile that could be launched by surprise. that is the nature of submarine warfare, even though north korean warfares are diesel, loud, relatively easy to detect, unlike the united states nuclear submarine fleet far more silent and stealthy. one of the reasons the u.s. navy