Re: DIY - discussion on building a DIY hookah diving compressor
The concern over expanding air is not that your lung will explode like a popped balloon, although, that would happen in the extreme. Its the expansion of air in the tiniest sacks, the alveoli, where the blood-gas exchange takes place. Burst a few of those, introduce air into the blood stream and you would be fortunate with paralysis from the embolism. The odds of heart failure or a stroke are what could kill you. As the air expands in those little sacs, its need a place to vent to or they will rupture long before you feel your lungs are over inflated.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.