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Yes, that was my question, thanks for answering it
So it was okay to dive deep air when there was no commonly available 'better system'?
In the 70's, 80's and early 90's, "deep" was a new world, that the adventurous felt compelled to explore. The smarter among the adventure diving set, would attempt to mitigate the increased risks of deeper diving, as well as possible.
There were many deep air deaths in the early 90's...and I was on more than a couple of deep body recovery dives, due to the problems associated with diving deep on air.
YOU don't see al the deaths happening today--all around you, even to people you have met and dived with. I knew Andre Smith of Divers Supply ( Triple Death Tragedy) ...I knew Craig Suavely... I knew several others that were not DIR, and before DIR, and this was a huge incentive to seek out a better way....It was insufficient to make George or Bill or me stop diving deep in the 92 to 95 timeline, but it was enough to make us wish for a better way.
With the body of knowledge we have today, with my experiences on both deep air and on Trimix, for me to purposely choose to dive deep air to 280 today, it would take a catastrophic need..such as an attempt to help someone that somehow was pulled down into deep water, when I was not prepared....it would not be my plan today, knowing what I know....
To your question...you kind of miss the point of the reality in the early 90's.... it was not what was "commonly available" as better in those days.....back then, we really did not know that trimix was better.....then some time around 96 ot 97, each of us gained enough knowledge, to KNOW there was a better way.... it had nothing to do with what was commonly available...it had everything to do with knowing what is better, and then attempting to use what is better.
This discussion is not about dealing with the issues that you may have, if you are diving in a part of the world where it is next to impossible to get a helium fill. You exist in a world where you actually KNOW that helium is much safer on a 280 foot deep dive. Less chance of ox tox ( pretty much no chance), and you are going to be smarter at 280 on trimix, then you on air....You KNOW this.
....then you have the issues of where this really kicks you in the butt, and forces you to utilize the knowledge.....It may do this well for a desire to dive a wreck at 280 feet deep.....this awareness you have may force you to NOT do this dive, if you can't get trimix....on the other hand, a friend of yours describes a holy grail of dive experiences, at 150 feet deep....no trimix is available.....Now it gets tougher.....now you might compromise , and figure once upon a time, this IS the way an advanced diver would have done this---so then you would talk yourself into trying it....and if you are one of the people "good" on deep air like George, Bill and I were, then this will probably be something you, or I could get away with....Is it the smartest thing that you or I could do, knowing what we know now?
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