Article from the website 9news.com.au
It sounds sort of like a mass of crickets. A high-pitched whine, but from what? It seems to undulate, even writhe. Listen closely: There are hear multiple, distinct tones that sound to some like they're colliding in a nails-on-the-chalkboard effect.
Click on this link for more http://www.9news.com.au/world/2017/10/13/07/59/cuba-sonic-attacks-is-this-the-sound-listen?app=applenews
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