his gear. The ascent is made slowly, and a constant exhalation of air is required. If you hold your breath during an ascent after breathing compressed air, and air embolism can be caused. This is when air escapes the lungs and enters the bloodstream, causing bubbles to form in the veins. These bubbles block the blood flow to the brain, causing death. Always exhale during a free ascent. The "buddy breathing" and "ditch and recover" methods are also important in diving. Buddy breathing is when you use your partners' air during a dive if yours is not available. The mouthpiece is to be switched back and Korell 6 forth every two breaths. The ditch and recovery is when a diver ditches his gear, and recovers all of it in ten feet of water. These are all a few of the techniques used in scuba diving. In scuba diving, you can always learn something new. There are may techniques to learn and can always be improved (Counsilman and Drinkwater 34-39). In diving, there is always a chance you could be hurt. Safety is crucial, and there are quite a few physiological concerns in the sport. When descending in the water, Boyle's law goes into effect immediately. As the water pressure surrounding the diver increases, the volumes of air both inside and outside the body of the body decrease in size. This pressure creates a compressing effect on the body that can result in injuries called Barotrauma. This can be avoided by equalization. The two major forms of Barotrauma on descent are internal and external squeeze. The sites of internal squeeze include the middle ear, the sinuses, and, occasionally, the teeth and intestines. As water pressure increases on descent, the air space in the middle ear is reduced, causing a vacuum, with the outside water forcing the flexible eardrum inward. If the internal air pressure is not equalized, the eardrum may become perforated. The sinus squeeze is when the sinuses are blocked. There are four sinuses that are filled with a...
