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Re: #2, that is active sonar, which is for useful for locating objects that are silent, e.g., rocks.[1] It also is very loud and disruptive for whales and dolphins.[2]

[1] https://oceanservice.noaa.gov/facts/sonar.html

[2] https://skeptoid.com/episodes/4236



Ah of course, the issue several years ago when the Navy's testing was causing whale / dolphin strandings...




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