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The First Stage ..( the bit on the tank) of a diving regulator senses the pressure exerted on the regulator ( and also on the body) to see how much it is being squeezed, it then compensates for the pressure by filling your lungs with more air than they could hold on the surface BUT because the lungs are being "squashed" the air fills your lungs like normal. The only potential problem comes when you ascend..because you have too much air in your lungs as it starts to expand, it could overinflate your lungs to the point they literally blow up!

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