Hear what expert says about ‘banging sounds’ picked up by sonar device… CNN 0 114 2023.06.22 00:36 https://www.youtube.com/watch?v=qrraE0nvC84 + 12 https://www.youtube.com/feeds/videos.xml?channel_id=UCupvZG-5ko_eiXAup… + 12 Hear what expert says about ‘banging sounds’ picked up by sonar devices