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If a diver is able to control his depth once they reach the Nitrox level of education as he should then why not use a pre determined floor. At 130' on 30% you have a pp02 of 1.48, inside the maximum recognized limit of 1.5 acknowleged by most agencies. What stops the "less experienced" when dropped in 90' from swimming into 120' or 130' as we frequently encounter off S. Fl. I don't see how anybody can call 1.48 pp02 hot when they practice 1.6+ at 20' on 100% 02. The slightest distraction could put you at 1.8. Marty Bernet IANTD/trimix Ocean Diving Inc. wrote: > Did you here the one about the guy that did all of his deco on bottom mix > because he was afraid that any other mix might put him in a hot mix > situation during deco if he failed to be responsible for his buoyancy > control? He thought it was too dangerous to use 100% O2 at 20' by what > kirvine implies. Now wall dives on Nitrox are off limits cause some dork > might end up needing Trimix while attempting a recreational wall dive. At > least in the Caymans a diver can swim towards shore and park on the sand at > 20' so he can switch to 100% O2 and not worry about high po2's eh? Use > common sense and you will figure out what's up with this thread. > Semper Deep, > Capt. Jim Mims > > -----Original Message----- > From: Katherine V. Irvine [mailto:kirvine@sa*.ne*] > Sent: Monday, September 14, 1998 6:27 PM > To: divetek@oc*.co* > Cc: techdiver > Subject: RE: Deep air dive...JUST SAY NO! > > Jim, this is one of the dumbest things I have ever seen from a dive > "instructor" and boat captain. This kind of dangerous nonsense and short > sighted thinking is why you find yourself in the situation you are in > now. > > Nobody should plan gas for a dive that is other than for the deepest > depth that can be hit on the dive. There is not only zero benefit from > diving a hot nitrox for this dive, there are endless risks. What if > there is a problem and one has to go to or ends up at the bottom , or > inside the hold of the ship at 1.8 partial pressure of oxygen? > > Only the worst idiot would recommend something like this, and right now > you are filling those shoes. You have no business recommending dangerous > practices like this. > > ------- > From: "Ocean Diving Inc." <divetek@oc*.co*> > Subject: RE: Deep air dive...JUST SAY NO! > Date: Mon, 14 Sep 1998 10:07:58 -0400 > > The Hydro Atlantic can be compared to a wall dive depending on how it is > dove. You can stay well within recreational limits, both time and depth, > by > exploring the upper superstructures from 115'-130'. EAN30 is a good > choice > for disciplined divers that can avoid diving beyond a specific depth. > Since > the dive is beyond 80' it should be treated as a deep dive. Recreational > divers should use the rule of thirds on gas management. IANTD has > guidelines > for proper equipment selection and redundant gas delivery for dealing > with > unlikely emergencies. As on wall dives, you can hover above the railings > on > this giant ship and look down at a beautiful, red gorgonian smothered > steel > wall that drops below another 45' or more depending on where you happen > to > be looking from. > If the current is strong we drift dive it for 10 minutes at 120' > and swim > with giant schools of amber jack and an occasional spotted eagle ray. > For a > second dive we go due west 2000' to a natural reef ledge off Boca Raton > Inlet and dive EAN36 - 40 at 60' and make the run worthwhile. There's > some > good hunting in this area and the seafood we porpoise on when get back > just > doesn't get any fresher. Enjoy. If you are not properly trained to dive > beyond 80' you are risking more than your life when attempting to do so. > You > are a danger to all involved. > Semper Deep, > Capt. Jim > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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