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At 12:00 PM 9/17/98 -0700, you wrote:
>
>Come on now Dan,
>
>Tri mix for a recreational dive to 80-90 ft?? So... just in case the
>diver can't control his/her depth. They will now need to carry
>doubles in case they go too deep (and you also gotta have enough gas
>for the rescue). Two deco mixes (50/50 and O2) cause 80/20 is "stroke
>mix" (rescuing someone at 190 is gonna get you into deco). How about
>a canister light. If they gotta go down to rescue someone you're
>gonna need to be able to see. Oh, Oh! don't forget the rule of
>thirds. Make sure you plan for that extra gas for.... Actually if
>you have to rescue someone you better plan for a new rule maybe the
>rule of fifths.
Dear Mat:
This is not intended to offend, but rather to center back to the origional
thread.
What caused this thread was the concept of a dive professional recommending
EAN 30 to clients and customers to explore the just the top of a deep wreck.
At 130 FSW this generates a PO2 of 1.48. This is simply too hot a gas for "
exploring the top of a deep wreck ". Assuming the sand is around 170 ', a
diver in trouble, gear problems, disorientated, medical complication,
assisting a buddy, rescuing another diver,whatever, would be at 1.85. This
is not even considering exertion or thermal reductions in the max allowable
PO2. This is not even considering backing off on your max allowable PO2 for
just plain old fashioned common sense. And please don't ever tell me that
you have nevetr exceeded below your planned depth for any reason on any dive
you have ever made.
Dan is correct, this is the wrong gas for this dive. This is too hot a mix
according to most recreational agencies standards, assuming we are calling
this a recreational dive ( which it ain't ). This is too hot a mix according
to most technical agencies assuming this is a technical dive ( which is a
more appropriate label. ) This is too hot a mix for this dive, period.
Are you considering contingencies by diving this deep wreck with EAN 30 ?
Are you planning for emergencies if you are diving this deep wreck with EAN 30 ?
Are you following established training procedures and universally adopted (
hopefully ) safety protocols if you are diving this deep wreck with EAN 30 ?
Aren't these basic considerations ??
Isn't this the foundation of safe dive planning ??
Now if you or any of the other 947 people on this list want to blend up some
EAN 30, pump a cylinder or cylinders and log some time exploring the
superstructure of this wreck, that's fine. That's a decision you make, and
most of you are far very experienced divers from what I have read. You are
responsible for you.
But a person in the position of authority, a boat captain, or shop owner or
blending technician, or instructor or some other dive professional / leader
who recommends this gas for that site is negligent. If you doubt what I am
saying, call any of the agencies, call any of the lawyers that represent
dive professionals, and they will say the same. NAUI Worldwide or Vincencia
and Buckley, my professional underwater liabilty insurers would FLIP OUT if
there ever came up in an accident investigation.
Hot nitrox is a recipe for disaster.
Speaking of hot, I have just donned my flame-retardant bunker gear, because
I know what to expect from some of you out there.
Kevin
" You'll never miss the water,
until the well runs dry . . .. "
as sung by Bob Marley
[\]
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^^^^^^^^^^^^^^^^^^^^^^
o o
o o
o o
_____ o o
(_/\_) o o o
=( )= oo
Kevin Rottner
--
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