NewsweekNorth Korea Is Rapidly Building Its First Operational Ballistic Missile Submarine, Satellite Imagery ShowsNewsweekAccording to the website 38 North—a program from the U.S Korea Institute at Johns Hopkins School of Advanced International Studies—satellite imagery of the Sinpo South Shipyard on the country's east coast, taken on November 5, shows the movement of ...North Korean Missiles Still Lack Re-Entry Capability, Seoul SaysBloombergNorth Korea is 'on an aggressive schedule' to develop a ballistic missile submarineCNBCDowning North Korean Missiles Is Hard.