How To Test Water For Sharks

I saw this viral video and wondered what kind of test this guy had come up with that was 100% accurate in testing waters for sharks.  He said he got it from a local.

Then I saw that the Atlantic White Shark Conservancy said "Great trick to detect nearby sharks."

So I watched.  I get it.  Do you?


I wouldn't be surprised if we start seeing more of this guy ... 



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