under water divers are advised not to hold breath while diving
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One of the first rules of safe diving is to never hold your breath, instead keeping you airways open as much as possible by breathing normally. ... If you hold your breath while ascending to the surface, your lungs and the air within them expand as the water pressure weakens.
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If you hold your breath while ascending to the surface, your lungs and the air within them expand as the water pressure weakens. ... Overexpansion of the lungs can also lead to air bubbles in your bloodstream or too much pressure on your heart, both of which can be fatal if not corrected.
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