Underwater UFO? Get Real, Experts Say 0 Randall Gross ScienceFebruary 2012Saturday, February 4, 2012 at 6:53 am PST • Views: 1,323 popularmechanics.com 190-foot-wide Disk-shaped Format Acoustic Waves Black Horizontal Lines Circular Formation Distortions Monterey Bay Aquarium Research I Side-scan Sonar Sonar Sonar Instruments Sonar Technique Underwater UFO Useless