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Ironically, despite drinking water his body will dehydrate. Salt water contains a high content of salt, much higher than in a human body. The kidneys can't deal with such a high amount of salt (actually sodium chloride). Thus the sodium concentration in the blood will raise and raise the more salt water he trinks, until it has reached a toxic level. Then the salt will detract the water from all the cells. The result is fatal, the sailor would die.

It is possible to drink some salt water, but only when enough fresh water is available to balance what the salt detracts from the body.

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15y ago

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