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Hi guys,

in the last two weeks I had some discussions with other divers about
their advanced diving courses.
A couple of them I met on a filling station. , both instructors, were
filling their doubles with nitrox23 for a IANTD technical nitrox
training dive on a wreck, with bottom at 62 meters (206 ft), but planned

maximum depth at 56 meters (185 ft).Deco mix was 40% nitrox. The course
was a Technical EANx, held by a IANTD instructor trainer. We did the
same dive the day before with a 18/50, reporting bad visibility and
11°C. on the bottom, and tried to discourage them diving deep on worse
than air. The answer was that trimix diving needs "the necessary
steps".....narcosis management i guess.

One week later a IANTD adv. nitrox instructor posted on an italian
mailing list the report of a dive accomplished during one of his courses

(basic nitrox+deep air) the day before; It was a wreck dive at 40 meters

(130ft) for 40 minutes with independent doubles (15L+15L) filled with
nitrox32 (PO2 1,6 on the bottom), and equipped with one first stage and
two seconds on each post. They decompressed accordingly to NOAA NNI
tables. Good choice!!

Not believing in what I saw and heard I gave a look to the IANTD web
site hoping these were only italian diving distortions, but the page
about standards is kinda long and not so clear, at least not directly
addressing to any of these procedures.
So, simply, I'd like to know if these procedures fall into IANTD
approved standards or not.

best regards

Andrea Marassich
Italia



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