What I read was actually different, But I did have it wrong brett set up doubles for some one else. Yes the same dive spot< think what I read was a dive before that one, cause I dont remember the trimix divers involved. Brett got alot of slack over it, so maybe they did it again with some of the same and more dive pros.
My point is I found this in 96, I never got certified till I moved to washington,cause in michigan I dove since I was a kid. Getting air and trimix fills was something you did your self or you always new some one that could, air at dive shops was not policed like it is now. When I was almost 16 when I was with some older divers we dove the kamloops, I went to Isle-royale to get gemstones. after they got done with there diving the anchor got hung up, since they all couln't go back down.
It was my first dive to 200, I was small then and doulbe burst disc is what you did to pack more air in the tank. Are aluiminum 80's always had over 4000 psi same with steel tanks.
Mr X diving past 200 isn't something I just started yesterday , Been doing it for 25 years.
In 96 it confirmed me of my analysis that it is whole lot easier and less gas to dive deep on air. To sum up what I said in previous reply is since 96, I have been going deeper than 200 cause I now know people dive to 300-400 on air. I 'll never reach past 320' on air cause my Phisolgy of my body gets extremly narced up. For the most part anything I dive past 250 I dive Tri-mix, Now that I have a full gas station set up maybe I'll go rebreather to use less gas. The Ironic thing is If I had to pay a dive shop for trimix fills or even air the gasoline to and from the shop, gas for boat, It would be very costly.
Here, diving the puget sound cause of the currents air is easier to dive,cause your not carring such a huge load. Shore diving cost more in gas in a vehicle than my boat and takes 3 times as long in a vehicle,so if you add the cost of diving, learning deep air diving is way more cost effective. Sorry instructors just my thoughts on it, and what I have learned in my 30 years of diving and about 12 years of diving the puget sound.