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There has been a lot of debate recently about Ntx80/02 deco.

Many believe that Ntx 80 provides similar deco time, and a safety buffer,
allowing you to descend 3 feet at 30 feet without exeeding 1.6ata of 02.

My opinion is that Ntx80 was championed by IANTD, for the purpose of lureing
divers away from 02, and into IANTD facilities for fills and certification to
breath 20% less N2 on deco.

While the advantages seem good in theory, I think they are more a product of
computer narcosis.  1.6 ata of pure 02 has an exellent safety record, and the
number of safe exposures on 02 far exeeds those on Ntx80. Remember, you can't
just apply po2 tolerance for pure 02 to mixed gas. They are distinct entities.

Rod Nairne.

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