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SCUBA-L  December 2000, Week 2

SCUBA-L December 2000, Week 2

Subject:

Re: Your deepest Dive on Air?

From:

Gozum_NT at OIT <[log in to unmask]>

Reply-To:

Scuba diving discussion list <[log in to unmask]>

Date:

Tue, 12 Dec 2000 13:22:04 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (69 lines)

Thanks Hugh,

Just looking at what those who dive and write to scuba-l have done, or do
routinely.  In a prior post, I discussed lobster hunters who dive to 150 ft
at least once weekly on air.



At 12:00 AM 12/12/2000 -0500, Automatic digest processor wrote:
>------------------------------
>
>Date:    Mon, 11 Dec 2000 18:27:49 -0500
>From:    "Huntzinger, Hugh A [AMSTA-AR-CCL-B]" <[log in to unmask]>
>Subject: Re: Your deepest Dive on Air?
>
>Marv writes:
> >
> > Is the floor on air really 185 feet [ppO2 ~ 1.4]?
>
>It depends on what your criteria is.   From oxygen toxicity, 1.4 is pretty
>safe, so the answer is basically no.  But this is very simplistic and
>ignores the hazards from Nitrogen Narcosis and CO2 buildup which really are
>the issues for air mixes.
>
>
>FWIW, the "record" for open circuit air scuba is roughly ~525fsw by Dr. Dan
>Manion (who later bent himself pretty good, but that's another story).   The
>ppO2 for this dive would have been ~10x the conventionally recommended
>limits (1.4 to 1.6; YMMV).
>
>You can also refer to a decompression chamber mix-up that was experienced by
>Richard Pyle, where he was put on pure O2 at ~8ATM (if I recall correctly)
>for a relatively short duration.
>
>What's common in both of these are events where someone survived very high
>ppO2 exposures.   All that this is really telling us is that some % of a
>population can survive such (short duration) exposures, By analogy, there
>are people who have survived the poison of the blue ring octopus, as well as
>there have been people who have survived skydiving accident falls of 5000+
>ft.
>
>Of course, there's also more people who have died from such exposures, but
>that's the nature of statistics of highly hazardous environments.   But
>since you can also get narc'ed at <100fsw and end up killing yourself in
>what would be considered a "depth-related/contributing" incident, it again
>comes back to what you are choosing as your criteria.  Risk, safety margins,
>all that.
>
>
>So while I've been deeper, I personally consider ~110fsw to be my pragmatic
>maximum operational depth on air.  This is the depth at which that I really
>noticed that my UW camera has become noticeably "hard" to use.   That
>"hardness" really is narcosis impairment and I guess that you can say that I
>carry a "Narcosis testing kit" with me :-)  I really do find it surprising
>just how "good" I can feel immediately prior to pulling the camera up to
>compose a shot...it really reveals just how insidious it is.
>
>
>-Hugh
>
>------------------------------



Warm regards,


Marv

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