Myth of Sudden Hypothermia
In humans, cold shock response is perhaps the most common cause of death from immersion in very cold water, such as by falling through thin ice. The cold water can cause heart attack (as cold blood from the extremities reaches the heart) and inhalation of water (and thus drowning) from hyperventilation. Some people, due to body type or mental conditioning, are much better able to survive swimming in very cold water.
Hypothermia from exposure to cold water is not as sudden as is often believed. A person who survives the initial minute of trauma (after falling into icy water), can survive for at least thirty minutes provided they don't drown. However, the ability to perform useful work (for example to save oneself) declines substantially after 10 minutes (as the body protectively cuts off blood flow to "non-essential" muscles).
Read more about this topic: Cold Shock Response
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