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Martin, Engineer
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Experience:  i'm 41 and i never stopped studying and experimenting
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Can sharks detect the heartbeat of, say, divers in the water

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Can sharks detect the heartbeat of, say, divers in the water if they happen to be near one? What organ(s)/mechanism(s) allow them to do this?
Hello and welcome. Absolutely they can. Nothing say if they can attribute special meaning to the hearth signal (like if the prey is afraid or exhausted) but it sure help them to detect a prey.

The organ is called the Ampullae of Lorenzini :

It's like if they got a built in cardiogram.
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