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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Vintage Diving Back Plate Scuba Tank Holder Aqua Lung US Divers
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Vintage US Divers Aqua Lung SCUBA twin tanks manifold Mariner harness
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Vintage SCUBA repro VOIT HOURGLASS mouthpiece for LUNG GRAY
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Vintage silver US Divers Aluminum Aqua Lung Scuba Tank 29 TALL 3000 Fast S
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Vintage gold DACOR Aluminum Aqua Lung Scuba Tank 29 TALL 3000 Fast S
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Vintage White STEEL US DIVERS CO Aqua Lung Scuba Tank 28 TALL 2250 Fast S
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Vintage White STEEL US DIVERS CO Aqua Lung Scuba Tank 28 TALL 2250 Fast S
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Vintage Yellow STEEL US DIVERS CO Aqua Lung Scuba Tank 28 TALL 2250 Fast S
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1950s AQUA LUNG VINTAGE SCUBA DIVING SNORKEL GEAR NEMROD SNARK III SEAMLESS
1950s AQUA LUNG VINTAGE SCUBA DIVING SNORKEL GEAR NEMROD SNARK III SEAMLESS
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Vintage US Divers Aqua Lung Early First Stage Scuba Dive Regulator 22328
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Vintage Scuba White Stag Sea 5000 Lung hose Regulator Meter RARE Hard to find
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US Divers Aqua Lung Vintage Scuba Diving Mask Triple Glass Navy Unused NOS
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Vintage US Divers Aqua Lung Early First Stage Scuba Dive Regulator 1HP 1LP Port
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Vintage US Divers Company Aqua Lung Scuba Mask Collectible Scuba Diving
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Antique Aqua Lung First Stage Regulator for Scuba Diving
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Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Goggles
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Rare Vintage US Divers Auqa Lung Full Face Scuba Mask Rubber has Cracking
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Vintage SCUBA Goggles US Divers Company Aqua Lung Magnifiers Steampunk Glass
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VINTAGE scuba AQUA LUNG DA NAVY APPROVED rare transition model
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Vintage US Divers Aqua Lung 29 Inch Scuba Tank With Vest
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Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Googles
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Vintage US Divers Aqua Lung 12527 Air Compression Tank Pressure Gauge Scuba
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Aquarius US Divers Aqua Lung first stage service kit Vintage Scuba
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RARE vintage scuba Rose Pro Aviation catalog 1961 1962 PRO LUNG super pro
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Vintage 1956 AQUA LUNG SCUBA DIVING CATALOG US DIVERS
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US Divers Nylon Zip Up Aqua Lung Scuba Suit Yellow Black 24 26 New
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