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Not really, using your same logic: if GUE stops you at depth using GFs (Buhlmann-based dissolved gas theory), UTD stops you at depth due to bubble theory. FWIW, the "1 min stops" in UTD RD and RD 2.0 are also 30 second slides, e.g. stop for 30 seconds and ascend 10 ft in 30 seconds. They also...

Fair enough. A friend of mine who recently went through GUE Tech 1 said "20/85 is the GUE standard." It appears he is wrong as well, as it's only a standard while in training. Regarding the outliers, the deep portion of RD 2.0 and 20/85 are pretty similar until you get to the gas switch "o2...

Says the agency with 20/85 as the standard...

Really? Where is the science that "debunks" it? What about using oxygen decompression? Does that work too in your mind? By "choking" on a word, do you mean splitting hairs about it's details? I'm wondering if you understand English well enough to know the definitions of the words you're...

I am genuinely interested in what Simon has to say actually. It's refreshing to read a post by someone so knowledgeable and qualified, like yourself, without all of the condescending statements. :p Do you think belittling the director of a training agency is appropriate for a "discussion among...

Good to know, thanks. I'm going to a NEUE event this weekend; I'm curious to know Bob's and other's opinions as well. Will report back if I learn anything worth sharing.

It hasn't changed, at what point did you think it had? You've claimed that UTD's RD has several elements that have been "debunked," which simply isn't true. I've asked you specifically which elements have, and received no response. Also, Dr. Mitchell mentioned, "debunks is probably too strong...

More patronizing from @Diver0001. In case you haven't noticed, my position hasn't changed. AJ, you're a GUE WKPP guy right? Do you or sway from GUE's prescribed 20/85 in light of the NEDU deep stop study?

"Incorrect" is an incorrect conclusion. The study concludes: "The practical conclusion of this study is that controlling bubble formation in fast compartments with deep stops is unwarranted for air decompression dives." "Unwarranted" is much different than "incorrect. " Meaning, it's not...

So it's somewhere above 30 and equal to or lower than 99, since 50 itself is sort of a shot in the dark as well? I know you are being careful to not recommend anything, but based on the logic if you think 30 is too low then the true answer lies somewhere above but not equal to 30 and equal to...

I also made a plot that illustrates the profiles we've been discussing for a dive to 170' for 20 minutes using 18/45 and 50% O2 for deco:

Hi Dr. Mitchell, Thanks for taking time to respond to me. I think it's quite rare a recognized expert with your background actively participates in these often pedantic online discussions, and for that you deserve some sort of an award! :) I've read through these two: Deep Stops (rebreather...

Interesting, I'll keep that in mind. I'll pose the same question to other RD divers who are able to execute a dive to that level. Those types of dives are way beyond my limits.

I was referring to Diver0001's statement in which he thought RD shortens shallow stop times because of the addition of deep stops. I'm not quite sure what argument you're making. Are you saying the O2-time on that slide in the video linked is terribly short? If so, I don't think that's related...

Ok, but where does the slide claim to reduce shallow stop time by adding deep stops when not using O2? The presumption by @Diver0001 was that RD adds deep stops to shorten the stops in the shallows which simply isn't true. Can you please point out where I have ignored anyone? Whether you think...

I didn't claim that and never dismissed the study, but you jumped to that conclusion. I'm talking about micro-bubbles and subclinical DCS. UTD RD 2.0 doesn't follow VPM. The deep stop portion of the ascent, if anything is even added, is meant to control the size of the bubble, not reduce...

We're in agreement there. What exactly are we disagreeing about?

Right, there’s always bubbles present after any dive. It’s the size of the bubble that counts. The deep stops added in RD 2.0 is meant to control the size of those bubbles, not accelerate deco time. O2-based decompression would certainly accelerate the ascent when compared to air. Hmm, I've...

I was and am willing to listen always, my position hasn't changed. I'm not sure how you thought I wasn't but I think you probably made a few presumptions about me that are incorrect. You presumed I hadn’t read the NEDU deep stop study when I had. You claim there are are elements within RD...

That's is indeed interesting John. From what I'm told in the training, the O2 window is used for the higher exposure of Oxygen with PPO2 = 1.6. In the old RD, the tech-1 profiles would do 5 min at 70', and 50 min at 60'. in RD 2.0, it's 3 min at 70' and 3 min at 60'. GUE uses all 2 mins...