Comments by "Daniel Ash" (@danielash1704) on "How Sonar Works (Submarine Shadow Zone) - Smarter Every Day 249" video.

  1. They can utilize drones under water to drop and return for decades the teather based micro phones..
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  2. The very same thing as a fish finder INE a single channel
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  3. Most ships have an interesting different sounds the very port they leave can be found by super sonic source heading .Sounding beacons assuming there still working send out specific points of origin.
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