Farah Pahlavi While Scuba Diving in Kish Island

The air that is in the tanks is compressed air as we know it outside, so parts nitrogen, parts oxygen, and some other gases as well.  Many people mistakenly believe that the air is pure oxygen, but that would actually poison the divers!  Because of the nitrogen in the compressed air, divers need to be very careful when diving to greater depths, as nitrogen narcosis can occur, which has the same effect as excessive alcohol.  This is easily solved by going back up to shallower waters.