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Mark _australia said..
Macro you miss the point that if these buoys repelled sharks, and they are arranged in a line offshore, they may scare the shark toward shore.
Shark swimming along, comes to a nasty electric signal and turns left or right. We don't know which way he will turn, and one way is toward shore.
Yes, maybe a signal ON the shoreline may scare them away but not a signal on an offshore buoy. So no, playing orca conversations on these buoys will not work. Else, if it did work I am sure for $33mil investment they would play orca conversations.
Then of course they may eventually learn to ignore the signal anyway.
Signal may be close to shores/ beach , so the closer shark approach the stronger and more repealing becomes. Sound could travel in the water long distance, with electric signal it may not be the same.