Quote: (Originally Posted by
david_1)
"it allows me to spike setpiont by just holding my breath for a few meters, so when i hit bottom i am ready and away with no messing about"
No clue whatsoever was intended.
Quote: (Originally Posted by
david_1)
"
I read above on here. It raised a question in my mind my body needs o2 to work and I almost understand I need less as I dive deeper.
No you don't. You need the same amound of molecules. At depth with a higher gas density you can:
- Breath a Nitrox that would be deadly on the surface. (e.g. with only 10% oxygen in it). At 40m it would still be as breathing 50% on the surface.
All this is speaking in absolutes. Relatively, when you compare it to OC the savings get higher with dept. A closed rebreather uses approx .7 liter oxygen per minute @ 100m whereas an OC diver at 90m uses 150 liter Trimix (@SAC=15l/min)
Quote: (Originally Posted by
david_1)
"
but if I hold my breath I am starving my body of o2 ?
Your body has a large reserve. You can do some 5 minutes without breathing. It is the CO2 produced by your body that causes the breathing reflex.
Quote: (Originally Posted by
david_1)
"when I start to breath again would my body just want more o2 so negate the holding breath part of the decent.
No not O2. It wants to get rid of the excess CO2. At the same time there isn't much to negate as rebreather divers don't need much gas in the first place.
Quote: (Originally Posted by
david_1)
"
This is just a question :-) and I still dont dive rebreather....
I guess somebody did something for another reason than you may beleive. Maybe if you list the context things start to make sense. As for the not diving a rebreather. Good for you. All the money burning in your pocket and still many other options to consider....
David[/quote]