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SCUBA-L  December 2000, Week 2

SCUBA-L December 2000, Week 2

Subject:

Re: Your deepest Dive on Air?

From:

Chuck Hopf <[log in to unmask]>

Reply-To:

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

Date:

Tue, 12 Dec 2000 00:31:41 -0600

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (60 lines)

It occurred to me the other day that being number one in SCUBA whether it is
on air, for penetration, for depth, whatever, is not a good place to be
since for the most part, the people that become number one only stay number
one until their number is up and they make a mistake.  Then they stay number
one posthumously until some other idiot replaces them.
-----Original Message-----
From: David Strike <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Monday, December 11, 2000 11:20 PM
Subject: Re: Your deepest Dive on Air?


>On Tuesday, December 12, 2000 10:27 AM, Hugh Huntzinger wrote:
>
>(snip)
>> 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).
>
>It's always seemed to me that there's no point to deep air records.  Going
>deep for its own sake is a meangless exercise unless it's to push the
limits
>of scientific understanding or has, as its purpose, a specific
>mission-oriented task.
>
>When, in 1915, the U. S. Submarine F-4 sank off of Hawaii, in 304 feet, US
>Navy Diver Frank Crilley reached the submarine in a dive that has rarely if
>ever been equalled by a helmet diver breathing compressed air.  In the
>'Twenties, experiments with helium showed that it was a far more beneficial
>gas for diving.  It's been in regular use for nigh on seventy years in
>commercial and military diving and - with reduced oxygen levels to maintain
>'safe' PPO2's - helped to carry working divers deeper than air ever could.
>
>It just seems to have taken an inordinate length of time for helium use to
>percolate through to the recreational market!  :-)
>
>(snip)
>> 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.
>
>Indeed it is.  The reason for deep air diving deaths may well be oxygen
>toxicity - but the chances are that it's caused by the diver's inability to
>think rationally and sensibly due to an excess of nitrogen.
>
>Strike
>

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