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Number one rule of Scuba diving is never ever hold your breath the pressure changes when you descend and ascend could damage your lungs. When ascending a diver does not need to just exhale they breathe normally unless they are using an emergency ascend in which case, depending on which emergency ascent they are using and for what reason, ie out of air and so on, will exhale on the way up to again ensure the pressure changes will not cause their lungs from over expansion and bursting

I hope this helps

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โˆ™ 2011-09-17 23:13:54
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Q: Why do scuba divers need to exhale air when they ascend to the surface of the water?
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