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 AMF VOIT LUNG SCUBA DIVING TANK  REGULATOR GREAT CONDITION BID NOW NR
VINTAGE AMF VOIT LUNG SCUBA DIVING TANK REGULATOR GREAT CONDITION BID NOW NR
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Swimaster MR12 Regulator And Second Aqua Lung Regulator for Scuba Diving
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Antique Aqua Lung US Divers Cousteau Gagnan Scuba Diving Double Hose Regulator
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Vintage Diving Back Plate Scuba Tank Holder Aqua Lung US Divers
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US Divers Aqua Lung Scuba Regulator Non Magnetic
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Vintage SCUBA repro VOIT HOURGLASS mouthpiece for LUNG GRAY
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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 1960s Scuba US Diver Aqua LUNG Knife
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Aqua Lung Calypso VI First Stage Regulator for Scuba Diving
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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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Vintage Aqua Lung US Divers Tempered Glass scuba Diving Mask and Snorkel
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US Divers Aqua Lung Vintage Scuba Diving Mask Triple Glass Navy Unused NOS
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Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Goggles
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Vintage Scuba Tank Healthways Water lung Scuba Tank And Scubair J Regulator
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SCUBA GEAR BUNDLE OLD SKOOL OCEANIC DEEP SEE AQUA LUNG DACOR US DIVERS
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Vintage Aquarius Aqua Lung scuba Mouth Pc Regulator Gauge Straps Fast SH
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Vintage Blue Aluminum DACOR Aqua Lung Scuba Tank 30 TALL 3000 Fast S
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Vintage US Divers Aqua Lung 29 Inch Scuba Tank With Vest
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vintage Aqua Lung Scuba Diver Diving Tank Bac Pac holderbeltsKam EZ pakmini
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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
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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Vintage scuba US DIVERS AQUA LUNG Viking Norseman used mouthpieces 3
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Aquarius US Divers Aqua Lung first stage service kit Vintage Scuba
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Vintage Scuba White Stag Sea 5000 Lung hose Regulator Meter RARE Hard to find
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