There can be no doubt that sharks hear perfectly. Experience has shown that they react to the sound of blows under water, to the sound of a bell, or to the noises made by a diver at work. In general, their reaction is one of intense interest. I have often tried bits of advice like If you see a shark approaching, beat the water with your hands, or the famous warning given to beginning divers, If you want to drive a shark away, cry out in the water. In my experience, such advice is almost criminal. In most cases the consequence was an immediate attack.
There seems to be no reason for the sharks frenzy. This, I think, is what hits me most, giving me a feeling of complete helplessness. The mad rush of hordes of sharks toward the exact point where one of their own has devoured a bit of fish is terrifying to watch. The beasts seem unstoppable and fatal and totally senseless.
Sometimes the shark will flee from a naked and unarmed diver, and at other times he will throw himself against a steel diving cage and hit furiously at the bars. With any other animal be it dog or crow I know that my actions or
reactions will have a direct influence on its behavior. But the shark moves through my world like a puppet whose strings are controlled by something other than the power moving mine; he seems to come from another planet. In fact, he does come from another time in that he has evolved little since his beginning. He perfectly adapts to his life, yet no one can ever predict what he will do.
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