Another item to file under useless information that just might one day save your life. Kenton Whitman explains how to survive a fall through ice on a frozen lake or river.

While it varies with water temperature and body mass, it can take 30 minutes or more for most adults to become even mildly hypothermic in ice water. Knowing this is vitally important in a survival situation, since people would be far less likely to panic if they knew that hypothermia would not occur quickly and that they have some time to make good decisions and actions to save themselves.

In other words - keep calm and kick your way out.