> As a PADI Rescue Diver might I ask what happens if the diver has to drop his weights?

The Diagram on the article showed a small emergency air supply chamber! I am sure that all the secondary emergency systems will also be properly designed...

> The other thing that concerns me about this is how much air can this extract feasibly?

I am sure that he is testing that!

> As you get deeper in the water due to the pressure of the water the amount of air contained
> in a lung full is far more than at the surface.

Please explain me this? It seems to me that "pressure" would reduce lung capacity!!!

> So at 10meters you use twice as much air as you did at the surface, at twenty meters you
> use twice as much as you did at 10 meters.

Where did you get this air-usage "formula" from? Do you have a link to that?

> So as a conventional diver gets deeper the less time their aqualung will provide them
> with air. So in a nutshell… how deep could you go before the device could no longer
> keep with demand?

Again, where did you get this from? From your PADI Rescue Diver instruction manuals?
What the article was saying is that by lowering the pressure you can recover more air, so the "reverse", which is to increase pressure, you would recover less air! So, if (1) one's air needs do indeed increase with the pressure and (2) by going deeper it increases pressure and, therefore, less air can be recovered, you would have these two key issues working against his invention!!!

eom