US Officials: ‘Highly Unusual’ Submarine Activity Detected in North KoreaFriends Read FreeSaveThis undated picture released from North Korea's official Korean Central News Agency (KCNA) on August 25, 2016 shows a test-fire of strategic submarine-launched ballistic missile being launched at an undisclosed location. (KNS/AFP/Getty Images)By NTD Television8/1/2017Updated: 8/1/2017Print