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Using scuba and Freediving

Thread Status: Hello , There was no answer in this thread for more than 60 days.
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Salehthefish

Free Diver
Jul 6, 2008
2,461
157
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Well the question simply is can a person take with him regulator at the depth like 10 meters use it down and then b4 going up he will b on empty lungs then go up? How can it b affected in different cercumenstances depth,bottom time etc...

Thnx 4 ur reply guyz in advance...
 
It is certainly technically possible, but I would strongly dicsourage anyone from doing so. Breathing pressurized air on apnea poses a very serious risk of barotrauma on the ascent. Even if you are aware of it and take care to exhale each time, a small error, ommission, or a stressful situation can lead to an uncontrolled ascent with a closed epiglots resulting in a serious and possibly fatal barotrauma.

The other problem is the increased risk of DCS - when diving on apnea with some added air at depth, you increase the nitrogen saturation. Combined with repeated dives, fast ascent rates, and high CO2 levels (which increases the chance of DCS), together with more important depths and bottom times than without the additional air, the risk of DCS is pretty serious.

Also the risk of nitrogen narcosis is elevated when you combine additional pressurized air (more N2) and high CO2.

And I would also not exclude a deep blackout because of too high PaCO2 - with the additional pressurized air and a high PaO2, the PaCO2 level rises quicker (due to the Haldane effect) and may surpass the safe threashold and cause a deep blackout which would be very likely fatal.

Another factor speaking against using the scuba tank would be if you try doing it while spearfishing or harvesting seafood - in many countries it would be still illegal and you may risk serious fines. So if you decide doing so despite the warnings, make sure the legislative of your country permits spearfishing with a scuba tank.
 
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Well the question simply is can a person take with him regulator at the depth like 10 meters use it down and then b4 going up he will b on empty lungs then go up? How can it b affected in different cercumenstances depth,bottom time etc...

Thnx 4 ur reply guyz in advance...

This doesn't sound much like freediving to me Saleh :) sounds more like scuba diving with emergency ascents (don't know if you scuba dive but one of the things they teach is emergency ascent which is more or less what you are describing but as the name implies, it's just for emergencies as it's risky!)

why would you want to do that out of curiosity?
 
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Even if you are aware of it and take care to exhale each time, a small error, ommission, or a stressful situation can lead to an uncontrolled ascent with a closed epiglots resulting in a serious and possibly fatal barotrauma.

Besides what trux states, there is still a risk of pulmonary barotrauma even if you perform a perfectly normal exhalation. There is a risk that the lungs may not release the air in a uniform way, meaning that some parts of the lungs may be overexpanded and subject to barotrauma. That is, while the major parts of the lungs are unaffected, parts of the lungs may be damaged. This has happened in the scuba diving community during training of "free ascents" (the emergency ascents that simos mentions), even during shallow ascents from the bottom of a pool, 5 m.

/Johan
 
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Many divers will read the above and think, "Well, I never heard of that, must be so rare that it won't happen to me." But, it might be more common than most people realize. Its not at all unusual for divers on this forum to report squeeze symptoms in depths that, theoretically, can't produce a squeeze. I have at least one diving buddy like that. Combine that shallow water squeeze tendency with high pressure air and you may very well have a recipe for bad things.

Connor
 
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By the way Saleh, I am not suggesting you do it but if you ever had to do an emergency ascent like that, it's not enough to empty the air at depth I think. In scuba emergency ascents, they teach you to keep exhaling air constantly while coming up by pronouncing a constant aaaaaaaaaaa sound. Even if you exhale at depth, you will notice that while ascending because of the air expansion your lungs will be filling with air and it's as if air appears out of nowhere and doesn't run out!
 
Try holding your breath on the surface without a regulator to save taking all the extra equipment. Then dive with just the air in your lungs.

There is a good forum called Deeperblue where you can get good advice.
 
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Thnx guyz and I appreciate all inputs... This question was raised by a friend of mine on Facebook & I've posted it here bcoz I do not want him to risk his life with this idea... For me I just freedive with my acceptable limits even if it is 5 meters...

Thnx again guyz for all inputs...
 
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