Water,Sports,Safety,Underwater sports Water Sports Safety - Underwater Diving
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Skin diving is not a sport you can learn casually. Even anexperienced diver should not attempt to teach you if he or she is not aqualified instructor. You must have lessons before you buy theequipment or attempt to go underwater. The best training can beobtained at a reputable diving club or school.Always dive with a companion. Even the most experienced divers can get into trouble underwater.Plan your trip carefully before you set out. Diving tables areavailable that tell you how much time you can spend at specific depthsand how much time you need to resurface. You must wear an accuratetimer and depth gauge.Check the weather forecast for the area in which you are divingbefore going out. Always tell a responsible person where you are goingto dive and how long you expect to be away. Report back to that personwhen you return.Do not dive near buoys or fishing spots. If possible, check withthe local fishermen to determine which areas are safe and convenientfor diving. Avoid fishing nets, buoys, and rocks that are covered withkelp.Always fly a diving flag when diving, and always use a surface marker buoy as well.As you go down, your ears begin to hurt. This is because thepressure outside the eardrums increases with the depth. The moment youfeel the pressure, you must pinch your nose and gently blow. This opensyour Eustachian tubes and equalizes the pressure on each side of theeardrums. If you do not equalize the pressure, your eardrums will burstat about 30 feet. For this reason, never dive after a heavy cold orflu, as it may not be possible to clear the Eustachian tubes.Compressed tanks contain the constituents of air, that is, 80percent nitrogen and 20 percent oxygen. Breathing pressurized nitrogensometimes produces a feeling of intoxication known as nitrogennarcosis. This becomes a problem when diving at depths of 75 feet(22.5m) or deeper. A diver's companion must be alert for the signs. Adiver may suddenly start behaving strangely, attempt to remove the facemask, or make indistinct and fumbling communication signs. The otherdiver must get the person to the surface as quickly as possible withoutproducing decompression sickness (the "bends"). Once the person hassurfaced, the narcosis wears off, leaving no aftereffects.Decompression sickness depends on the amount of time a diver isat a certain depth as well as the depth itself. The diver experiencesacute muscle cramps and breathing difficulties. He or she must betreated immediately. The only safe way of doing this is to get thediver to the nearest decompression chamber.If you miscalculate the amount of air that you have left in yourtank and consequently run out, it is extremely dangerous to hold yourbreath and rise to the surface. As you rise, the air in the lungsexpands as it decompresses, and the lung may rupture. You must blow airout as you rise. Skilled divers sometimes share the air from one tankwith their companion as they surface.
Water,Sports,Safety,Underwater