Hi All

Just wondering if anyone has heard of the latest mixed gas style of
diving? My buddies and I are diving air that is enriched with
Nitrogen.

Why on earth would we do that?

The idea is to enjoy the thrill that comes from 'rapture of the deep',
but at a depth that is sensible and not so dangerous.

A typical mix would be 97% nitrogen and 3% 02. This would be our
backgas in our doubles. We would also carry a stage bottle of normal
air as a travel mix, and a stage of 02 for decompression. We would
dive the travel mix to a max depth of 165 FSW (6 ATA)then switch to
backgas. We can then enjoy an EAD of 210 FSW!!! But this is done at
the relatively safe depth of 165. Our decompression is a little
shorter and safer than at 210 and we can instantly reduce the partial
pressure of nitrogen by switching to our travel mix should the
narcosis be too much. The best part is that oxtox is a non issue with
a P02 of .18 at depth.

This is a fantastic way to work up to deep air dives, or as a
prerequisite to trimix with out the risk of 'true' depth.

As no agency is currently teaching this, we are looking to start one
for certification of divers and gas blenders. Any input is
appreciated.