I grew up in Alaska. The water off the coasts there averages about 40 degrees fahrenheit. If you get into this water without a survival suit or a dry suit or something like that, You have about 5 minutes of actual usable time to save yourself. After that, hypothermia sets in and you get very groggy and delirious. After 10 to 15 minutes you go unconscious, and then you drown. Good swimmer or bad, if you aren't out of the water inside of five minutes, you're a goner unless rescued, and even then can die of exposure.

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