Eli5: why isn’t radiation from under water/ ground nuclear tests a concern?

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Seems to me you’d still have radiation from the bomb regardless of where it was set off. Isn’t sea life endangered with underwater nuclear tests? How is the radiation kept from coming up into the atmosphere with either underground or underwater nuclear tests.

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Water is a great blocker of radiation. About 4 meters of water between the source and you decreases radiation by a billion-fold.

So yes, anything in the immediate vicinity gets boiled alive, but it’s a tiny tiny portion of the body of water you’re testing in, in the grand scale.

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