The shock to the system may not allow the person to think or act clearly. Cold water can quickly numb the extremities. Cold hands may be unable to fasten the straps of a life jacket, grasp a rescue line, or hold on to an overturned boat. Everyone should always wear a life jacket. This becomes especially critical when boating on cold water.
Cold water causes the body's temperature to drop.
Lowering of the body's core temperature is called hypothermia. It can render a person helpless in minutes. Hypothermia begins with shivering. Judgment becomes clouded and unconsciousness sets in. Death can occur if hypothermia is not treated.