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Rich,

some of us can do the hydroatlantic on trelatively little gas . The max
depth on the sand is 180 feet, when I do classes on it we do a 30 minute
bottom time and most often have a 160 to 170 max depth. I would submit to
you that even most(not all) good divers cannot complete that dive on a
single tank. We usually do a combination of swimming the wreck to let the
divers get it down combined with some penetration. We dive it on tables with
run time and and use EAN 80 on deco which is slightly faster than o2 on that
profile (we start the 80 at 30 feet) the run time is between 64 and 70
minutes depending on whether the diver elklects to go on the 160 or 170
schedule. To me this dive warrants either large singles or doubles. As I'm
not aware of a diver dying from reserve air I opt to teach this program in
doubles and on my personal dives I use either doubles or a 108 overfilled so
it equals double 70's as on at least two previous occassions I have met
divers who I did not know that were in gas management problems and had to
give them gas so they could make it to the surface i will still stick with
my doubles on this dive. I do that dive on double oms 85's or the overfilled
108.
 And yes I do surface with close to 2000 psig so I have a large surplus of
gas. On my personal dives I do a 40 min + BT and surface with 1400 psid
which is well over 1/3 reserve. 

Just my two cents on the gas that should be carried on this type dive. Yes
you can do bounce dives with much less.
Tom
At 09:48 PM 7/7/96 +0000, you wrote:
>
>
>> to the sand, and the wreck sits upright, making it a 170 foot dive, or
less, a 
>> depth from which free ascent is possible
>
>What planet are you from? Technically, you are right.  Hell, some guys can
>get all the way down to 400 feet and then make a free ascent all the way
>up.  However, in the real world of Scuba, anyone who has actually had to
>make a free ascent knows that even 60 feet is a hell of a stretch.  Deeper
>than that you need to rebreathe off the BC. 
>
>Nevertheless, I agree that "naked with the magic stone" is a valid diving 
>configuration in many cases, including the dive you described.
>
>Rich
>

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