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In order to exercise safety when scuba diving and to ascend slowly, you must have air in your tank. Monitoring your air supply and air consumption is critical frequently throughout your dive. By the time you are down to 1,000 p.s.i., you should be well aware to where your dive boat or the beach is. By 500 p.s.i. you should be in the process of making a slow, controlled ascent back to surface. Monitoring your air supply is absolutely critical to your well being. Watch your gauges constantly throughout your dive and never, never run out of air.