One of the main components of diving equipment, the air in a scuba tank, usually reflects the air we breathe every day. Specifically, is approximately 80% nitrogen and 20% oxygen. Your body can not use nitrogen. Both of these gases can cause problems when breathing deeply. Ever heard the expression "Too good is bad for you"? This applies to oxygen. Never a tank with 100% oxygen, and do not dive below 100 meters with standard air (79% nitrogen 21% oxygen) and oxygen toxicity (hyperoxia) can occur. This can damage the central nervous system, and also lead to disorientation and difficulty breathing. Severe cases can lead to cell damage and even death. About 100 meters, nitrogen narcosis (rapture of the deep) is a threat. Under the pressure of nitrogen has a narcotic effect that can affect their views and actions. You're on your subconscious to drugs in their scuba tanks! A diver is reckless and anxious. Although you can learn to deal with anesthesia and it still works, you can not build a tolerance, so that all risks of deep sea divers watch. Nitrogen narcosis is a problem in shallower dives, and the symptoms disappear completely when climbing. Perhaps the most famous and the risks associated with decompression sickness from diving air. Decompression sickness is caused by the body to absorb nitrogen, while in depth. The deepest dive, and the longer they remain in the background, more nitrogen is absorbed by tissues in the body. The only way to remove nitrogen from their respiratory system. If the dive tables, no decompression dives, or a plan to follow, usually nitrogen can be eliminated. However, if it rises rapidly to nitrogen bubbles can form small or decompression sickness "bends" cause. These bubbles often cluster in the joints causing severe pain. How are you bubbles can form in many different areas of the body, symptoms may vary. These include dizziness, weakness, tingling and perhaps the best known of the symptoms, joint pain. The most severe cases even death. If you suspect decompression sickness, seek medical attention immediately. Treatment is usually re-pressurize the diver in a hyperbaric chamber. Often, medical personnel are attached to this treatment with drugs, never try it again a diver in the water and DCS pampering! Because the treatment usually lasts for hours, a diver can not remain in the water so long, even if the additional scuba tanks. It is important that your scuba tanks filled with a reputable dive shop to get, since without careful maintenance, pollutants such as carbon dioxide can be introduced to your tank. This may cause nausea and dizziness, and even make you sick, the last thing you want when your 50 meters underwater. If you find your air has a smell or taste do not use that tank.