Mysterious 'sonar anomaly' detected off North Carolina's coast

Daily Mail•June 27, 2018

https://www.yahoo.com/news/m/1c2e6fa5-06c2-341f-8620-f2eb91128429/ss_mysterious-%27sonar-anomaly%27.html

http://www.dailymail.co.uk/news/article-5895045/Mysterious-sonar-anomaly-detected-North-Carolinas-coast.html?ITO=1490&ns_mchannel=rss&ns_campaign=1490