You can die from hypothermia in as little as 3 hours
If a person is exposed to water temperatures of less than 92 degrees Fahrenheit, hypothermia can already occur. The body core temperature drops and the blood circulation continuously decreases. At first, arms and legs will start to feel cold, while the body conserves the heat for the inner organs and the brain. The decreased blood flow causes the person to lose muscular control of the arms and legs, making swimming impossible. At that point, drowning will most likely occur. Even a person with a PFD (personal flotation device) may have difficulties keeping from floating face down, especially in rough waters. As the brain cools down, confusion sets in and the chances of making rational decisions, such as grabbing a rescue rope, are very slim.
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