![]() ![]() And in reality, it may last even less time, because at depth you may be a little more excited and breathing a little faster! What is first stage and second stage regulator? Simply put, if a cylinder lasts 60 minutes on the surface, it will only last 20 minutes at 20 meters/66 feet/3 bar. How long will it last at 20 Metres 66 feet breathing normally? This gentle pressure opens the eustachian tube and flows air gently to the middle ear. Most divers are taught to equalize by pinching their nose and blowing gently. The key to safe equalizing is to get air to flow from the throat to the ears through the opening of the normally closed eustachian tubes. ![]() Failing to equalize these air spaces as you descend during a dive can, therefore, cause pain and discomfort when those areas are “squeezed.” What happens if you don’t equalize while diving?Įqualizing when diving: when, why and how Because of this, the water’s building pressure while diving causes the gas volume in your body’s air spaces to decrease. All of the review sections in the book are extremely helpful when preparing to take the test, and there is no downside to doing them, right? In fact, you most likely have seen the questions in the review sections of your book in one form or another. The PADI Open Water Diver written test is not very difficult. ![]()
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