Breathing from BCD

[VooDooGasMan]

As netdoc has pointed out, you keep a caution zone on n2 dissolving and you are going to have better dives, and learning to do multiple dives and feeling good when you get out. 15 mins at 4m has always helped my diving, its a time to see the little things.



Happy Diving

 

[Puffer Fish]

I remember this being taught as part of my NASDS Open Water course... It was explained but I dont think we did it because of the bacteria issue.

Go back a few more years and it was commonly taught. A Fenzy came with directions for doing so. Doesn't anyone keep their BC clear anymore?

Note: So was breathing off of a tank valve, but for the life of me, cannot figure out where that would come in handy...

 

[Foxfish]

Go back a few more years and it was commonly taught. A Fenzy came with directions for doing so. Doesn't anyone keep their BC clear anymore?

Note: So was breathing off of a tank valve, but for the life of me, cannot figure out where that would come in handy...

Breathing off a tank valve. :shocked2: Imagine the warning that would come out in the tank manufacturer's manuals if this was done today.

"When breathing off tank valve, ensure that the valve is opened carefully. The valve should not be fully as this could cause lungs to be inflated beyond capacity or the tank to be propelled into planetary orbit. Either event could result in serious injury or death."

 

[Foxfish]

As netdoc has pointed out, you keep a caution zone on n2 dissolving and you are going to have better dives, and learning to do multiple dives and feeling good when you get out. 15 mins at 4m has always helped my diving, its a time to see the little things. Happy Diving

Interesting to hear this about safety stops. Thanks.

 

[Cave Diver]

Here are a couple of the old threads on this subject from the archives

http://www.scubaboard.com/forums/ad...s/304442-re-using-air-bcd-dire-emergency.html

http://www.scubaboard.com/forums/advanced-scuba-discussions/270711-breathing-bc.html

 

[Bob DBF]

I heard a story about a group of people trapped in a submarine in more than 300 ft of water. There was a diver with them who instructed them about the cesa telling them not to pass their own bubbles on the way up. They all made it...good illustration for never holding your breath huh?

Students in Submarine school have to perform an emergency ascent in a water tower in order to pass. Submariners have to requalify to maintain proficiency. This has been taking place since before WWII.

The only emergency ascent escape from a sunken submarine was from the USS Tang during WWII. Oct 25,1944 13 men escaped, 9 men made it to the surface and 5 men made it through the night and spent the rest of the war in a POW camp with 4 others who were blown from the bridge or escaped from the conning tower as she sank.

There is no "safe" ascent speed, some escape appliances are hoods and you breathe in them normally to the surface, the major point is to keep your airway open, we were taught to ho,ho,ho all the way to the surface, no appliances.

The procedure is to get into the escape trunk and pressurize with air to depth in under a minute, the hatch is opened and you head for the surface ASAP. By doing a superfast bounce dive you minimize nitrogen exposure.

Oh yeah, it's fun.

End of sidetrack.

Bob
--------------------------------
Submarines once, Submarines twice ...........

 

[Emparo821]

when i first read the article i thought it sounded interesting, but after reading the doc's response i see the honest truth. If you do run out of air, there is a 99.9% chance that you did something wrong or were sloppy. The remedy for that is to get smart and either redo or get more and better training.

 

[copter53]

Dave Walls of PADI spelled out his agency’s recommended options for low/out of air situations, in order of priority:

Make a normal ascent, if your tank isn’t completely empty;
Ascend using an alternate air source (redundant supply or buddy’s octopus);
Execute a controlled emergency swimming ascent;
Buddy-breathe with a single regulator supplied by another diver;
Make a buoyant emergency ascent.

This is from then article posted by DocVikingo, Based on this list you would do a cesa b4 buddy breathing with a single reg, Why is that? Wouldn't it be safer to buddy breathe then to cesa?

 

[The Chairman]

This is from then article posted by DocVikingo, Based on this list you would do a cesa b4 buddy breathing with a single reg, Why is that? Wouldn't it be safer to buddy breathe then to cesa?

Buddy breathing is inherently more complicated than a CESA and traditionally there is a much higher incidence of injury during training. So much so that most agencies that I know of now FORBID doing any buddy breathing while ascending for this reason. None forbid a CESA if the instructor takes proper precautions to avoid embolisms from ascending without an open air way. NASE is the only agency that allows for horizontal CESAs and does not require their instructors to do these in OW.

In case anyone missed it, while still far better than drowning, having to do a CESA means you have violated two main rules of safety on the same dive: OOA (Out Of Air) and OOB (Out Of Buddy). It's time to re-evaluate your practices before you find yourself OOL (Out of Luck) and seriously injured or dead.

 

[dmoore19]

Buddy breathing is inherently more complicated than a CESA and traditionally there is a much higher incidence of injury during training. So much so that most agencies that I know of now FORBID doing any buddy breathing while ascending for this reason. None forbid a CESA if the instructor takes proper precautions to avoid embolisms from ascending without an open air way. NASE is the only agency that allows for horizontal CESAs and does not require their instructors to do these in OW.

In case anyone missed it, while still far better than drowning, having to do a CESA means you have violated two main rules of safety on the same dive: OOA (Out Of Air) and OOB (Out Of Buddy). It's time to re-evaluate your practices before you find yourself OOL (Out of Luck) and seriously injured or dead.

Don't you mean SOL?