When swimming in chilly water, keep an eye on yourself and remain near to the shore. If you see your body shivering or your muscles cramping, get out of the water immediately soon. You can also swim out of water if you are feeling dizzy or weak. The best way to deal with drowning is to perform CPR if someone has been submerged in water for a long time. Professional help can also be obtained by using the emergency number listed below. Don't try to revive someone who has drowned; call for assistance instead. People have survived being underwater for as long as 30 minutes, but most die within 10 to 20 minutes without medical attention. The older you are, the more likely it is that any minor injury such as a cut or bruise will become infected if you are not treated quickly. In young people, many injuries found on autopsy have healed perfectly well even though they appeared at first glance to be quite serious. As with all accidents, there is no sure way of predicting how long you might survive in the water, but statistics show that most people who drown do so within half a mile of land. The more serious your injuries, the farther you should swim until help arrives. Coast guard vessels and aircraft patrol our waters, and they are usually able to reach anyone who needs help.