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In Australia some of the concerned individual got together and wrote a code of 
practice for Technical Diving.

Although the code covers redundancy, minimum equipment, emergency equipment etc 
it also states that the max PPO2 should not exceed 1.5 ATA and the max PPN2 
should not exceed 4.5 ATA and that a backup/redundant gas should not put the 
diver in a more narcotic state than the gas planned for that depth.

These values were agreed upon by equipment manufactures, ANDI, IANTD (TDI was 
not in Auatralia at the time) and other concerned parties.

ANDI Auatralia complies to the above values and suggest that a PPO2 of 1.4 
would be safer.

This seems to be simple enough.

ANDI Auatralia also has a simple course structure, although the names are 
different it is basically

1. Nitrox
2. Decompression
3. Tri-Mix
(Training in wreck penetration and rebreathers is also available)

Each of these programs are objective based, so if you can do the job you can 
move on to the next if you can't, keep practicing until you can.

Sure we charge dollars but if you don't measure up you fail no matter how much 
you pay.

Richard Nicholls
ANDI IT #24

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