Lung Scuba

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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 AQUA LUNG US DIVERS STEEL SCUBA TANK Made in 80s deco
VINTAGE AQUA LUNG US DIVERS STEEL SCUBA TANK Made in 80s deco
$60.00
Vintage Aqua Lung Calypso IV Scuba Regulator Octopus and Dacor Gauges
Vintage Aqua Lung Calypso IV Scuba Regulator Octopus and Dacor Gauges
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Vintage USDIVERS AQUA LUNG DIVING SCUBA SNORKEL MASK SS BAND TEMPERED GLASS EX
Vintage USDIVERS AQUA LUNG DIVING SCUBA SNORKEL MASK SS BAND TEMPERED GLASS EX
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Swimaster MR12 Regulator And Second Aqua Lung Regulator for Scuba Diving
Swimaster MR12 Regulator And Second Aqua Lung Regulator for Scuba Diving
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Vintage Aquarius Depth Gauge Aqua Lung US Divers Orange Face Scuba Wrist
Vintage Aquarius Depth Gauge Aqua Lung US Divers Orange Face Scuba Wrist
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Aqua Lung Professional Scuba divers 0 3000 Compressed Air Gauge US Divers Co
Aqua Lung Professional Scuba divers 0 3000 Compressed Air Gauge US Divers Co
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VINTAGE US Divers Co Aqua Lung Scuba Divers gear compressed air gauge
VINTAGE US Divers Co Aqua Lung Scuba Divers gear compressed air gauge
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Aqua Lung Aqualux Vintage Scuba Dive Light old but works perfectly
Aqua Lung Aqualux Vintage Scuba Dive Light old but works perfectly
$45.00
Cozumel Aqua Lung Mexico Divers Caribbean Scuba Diving Snapback Trucker Mesh Cap
Cozumel Aqua Lung Mexico Divers Caribbean Scuba Diving Snapback Trucker Mesh Cap
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Vintage Scuba VERY RARE Aqua Lung Caravele Fins w detachable blade
Vintage Scuba VERY RARE Aqua Lung Caravele Fins w detachable blade
$25.00
Vintage Aqua Lung US Divers Company Scuba Dive Mask yellow black
Vintage Aqua Lung US Divers Company Scuba Dive Mask yellow black
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Vintage Aquarius depth gauge Aqua Lung US Divers orange face scuba wrist
Vintage Aquarius depth gauge Aqua Lung US Divers orange face scuba wrist
$70.00
Vintage 1967 AQUA LUNG US Divers Catalog Great Pics  Graphics  Prices Scuba
Vintage 1967 AQUA LUNG US Divers Catalog Great Pics Graphics Prices Scuba
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Vintage SCUBA US Diver Aqual Lung Calypso IV Regulator  Hose
Vintage SCUBA US Diver Aqual Lung Calypso IV Regulator Hose
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Vintage Aqua Lung US Divers Yellow handle Diving Scuba knife japan Stainless
Vintage Aqua Lung US Divers Yellow handle Diving Scuba knife japan Stainless
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US Divers Aqua Lung Mask Vintage Japan Goggles Scuba Gear Tempered Glass
US Divers Aqua Lung Mask Vintage Japan Goggles Scuba Gear Tempered Glass
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VTG DACOR SCUBA DIVING LUNG DOUBLE DIAPHRAM 2 STAGE REGULATOR SN6278 LK
VTG DACOR SCUBA DIVING LUNG DOUBLE DIAPHRAM 2 STAGE REGULATOR SN6278 LK
$25.00
Vintage Aqua Lung US Divers Scuba Diving Gear Regulator Tubing Gauges Mouthpiece
Vintage Aqua Lung US Divers Scuba Diving Gear Regulator Tubing Gauges Mouthpiece
$49.99
Vintage SCUBA repro VOIT HOURGLASS mouthpiece for LUNG GRAY BBB
Vintage SCUBA repro VOIT HOURGLASS mouthpiece for LUNG GRAY BBB
$39.00
Vintage 1958 US Divers Aqua Lung catalog Scuba Gear San Diego Divers Supply
Vintage 1958 US Divers Aqua Lung catalog Scuba Gear San Diego Divers Supply
$85.00
1950s AQUA LUNG VINTAGE SCUBA DIVING SNORKEL GEAR NEMROD SNARK III SEAMLESS
1950s AQUA LUNG VINTAGE SCUBA DIVING SNORKEL GEAR NEMROD SNARK III SEAMLESS
$499.00
Vintage US Divers Aqua Lung Early First Stage Scuba Dive Regulator 22328
Vintage US Divers Aqua Lung Early First Stage Scuba Dive Regulator 22328
$23.50
Aqua Lung Calypso VI First Stage Regulator for Scuba Diving
Aqua Lung Calypso VI First Stage Regulator for Scuba Diving
$34.99
Vintage US Divers Aqua Lung Early First Stage Scuba Dive Regulator 1HP 1LP Port
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
Vintage US Divers Company Aqua Lung Scuba Mask Collectible Scuba Diving
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Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Googles
Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Googles
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Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Googles
Vintage Aqua Lung Scuba Diving Mask Tempered Glass US Divers Co RARE Googles
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1972  Aqua Lung US Divers catalog vintage scuba Aquamaster BBB
1972 Aqua Lung US Divers catalog vintage scuba Aquamaster BBB
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vintage Aqua Lung Scuba Diver Diving Tank Bac Pac holderbeltsKam EZ pakmini
vintage Aqua Lung Scuba Diver Diving Tank Bac Pac holderbeltsKam EZ pakmini
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Vintage Scuba Tank Healthways Water lung Scuba Tank And Scubair J Regulator
Vintage Scuba Tank Healthways Water lung Scuba Tank And Scubair J Regulator
$100.00
Vintage Aqua Lung US Divers Tempered Glass scuba Diving Mask and Snorkel
Vintage Aqua Lung US Divers Tempered Glass scuba Diving Mask and Snorkel
$34.50
Vintage Aquarius Aqua Lung US Divers Orange Scuba Wrist Gauge Original Box
Vintage Aquarius Aqua Lung US Divers Orange Scuba Wrist Gauge Original Box
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