Lung Scuba

Can you ever hold your breath while scuba diving?

Is it dangerous even when neutrally buoyant?

The first thing they teach you in Scuba is to breath continuously and Never, Never hold your breath. It is extremely dangerous to hold your breath while scuba diving.

The reason is that when you descend air compresses. (Water doesn't and that is why you don't feel the pressure so much on your body 'cos your body consist mainly of water). What does compress however are your air spaces like you sinuses and lungs. Scuba equipment delivers air at a pressure equal to the surrounding water pressure. If you go down breathing and then decide to hold your breath and then ascend, even by just a metre/2 or 3 feet you could injure your lungs as the air expands according to the pressure around it. This is known as lung over expansion (or rupture).

We are taught even when our regulator gets pulled out you still maintain "breathing" by letting a steady flow of small bubbles out.

Of course this is all different for skin divers.

EDIT: Are we talking about classes as in learning to dive or are we talking about actuall diving? You figure that one out guys.

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