Hi Peski, I was not disputing any of his knowledge! I was just trying to get more educated on the subject, so thanks for the info link...

You say "At 10m, atmospheric pressure is doubled, and it takes twice as much air to fill your lungs to full capacity". What I am trying to understand is why it that it takes twice as much air to fill the lungs? Is it because the normal air at surface is being compressed to half its size due to the pressure at 10m?

You then say "You consume compressed air from the tank twice as fast as you would floating at the surface. Every 10m you descend you consume more air with each breath. At 40m, the approximate limit for safe recreational diving, you are consuming 4 times as much air with each breath as you would at the surface". OK, so this must mean that normal "air" is being wasted by the lungs since you are now breathing the equivalent of compressed air as you go deeper and deeper, like to 40m! No wonder you are "consuming" so much more air since most of it is being wasted!!!

I guess that since you actually need all of it to stay alive at 40m, it is not really being wasted.

Either case, this new invention would have to be "designed" to compensate for this lose of air lung efficiency as one goes deeper and deeper! It also seems like less and less air is stored in water as the pressure increases, so, like I said before, this is a double problem!!!

It seems like their pressure changing unit that separates the water from the air would have to speed up by at least by 4X as one is diving deeper and deeper, increasing battery usage and, therefore, decreasing total dive time...

wirelessguru1