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That man was a remarkable diver with a dearth of experience far, far beyond us normal mortals. And he died diving. The idea that, "I'll just throw some textbook rules that I read in a book or on the internet at accident managment and that will probably be fine" is probably not fine.

If your rebreather breaks you're on OC. Learn how to cave dive OC first.

When you say "inverted tanks" do you mean inverted from "normal" CCR config? I dive my rebreather valves down (what I consider "normal" and actually need floaty fins (Deep 6 Eddy's... the floatiest fins I know) in fresh water for them. Otherwise, as you say, there's no way you're getting your...

I'm 6'5" My feet are really far from my center-mass and need their own buoyancy control. But I do have orangutan arms that could reach tank valves if I lowered my tanks significantly enough to wear a floaty fin. A person who is 5'5" will not have orangutan arms and wouldn't be able to reach...

That big mojammy is definitely overkill as a trim weight. When I get home (I'm out of town right now) I'll try to remember to take a picture of what we use. It's basically just a 2lbs v-weight with 6" or so of webbing screwed into the "flat" side with a hole melted into the webbing. It's just...

Raise the wing too high and you wind up with all the lift available by your shoulders, pinching off the bottom gas movement (assuming you've got a donut wing) with the tanks and pinching off a lot of the top because of the hoses pressing down and crimping the wing in places. You might consider a...

And that's one of the reasons I strongly prefer a frog kick. You get a 5 second break for every one second of work. Managed to do 5-6 hour dives (no deco... all swimming) pretty comfortably with such a routine. At least, you do if you're properly weighted and trimmed you get that break. If...

I mean... that's kinda what the whole endgoal is, right? But it's also a bit of a choose your own adventure since every one of those forces is going to be different on every individual diver. So they've all got to fill in the values themselves (or, at least, if not actually write in values...

"No, really," I often find myself saying, "You're actually head heavy." "I'm not, though!" comes the cry, "I can't keep my feet up like you keep saying!" "Because you're actually head heavy," I say as the whilrligig of a conversation continues. So I wrote a thing about it HERE...

Without getting into math... If I'm wearing a stage, I'm breathing a stage. For you example of a circuit: Why not just breath the stage to near-dead and retain donatable backgas as emergency gas (with the built-in safety buffer of retained gas but, as I said, I'm not gonna get into math...

In warm water: 45/85 In cold or knowing I’ll be working hard: 35/75

Also: by the way… Way to keep the stigma of DCS alive. “He probly did something stupid.”

I tried to be pretty clear that the two times I’ve experienced any issues were WAAAAAAAAAAAAAY outside the scope of the rule of 130 as I use it to ballpark what my computer is going to tell me in an hour or so. The one time was a 90 minute dive to about 300’ The other was after a week of two...

You win at the thread.

I answered your question. The answer was “right here in this thread.” And now on to my question: Using average demonstrably works even though you say it doesn’t. Explain.

Still waiting on what your tables or whatever say about my dive profiles.

Literally earlier in this thread, Shirley: Me: “Ive been bent only twice, both of them completely benign and semi-deserved, in thousands of dives, many of which are likely to have been far more advanced and aggressive than most are likely ever to do.” Some person who doesn’t know me from Adam...

I’m just gonna call these: Why Average Depth is More Interesting than Max Depth According to the PADI nitrox 32 tables I’ve only got 25 minutes at 110 feet. So… apparently, I’m bent as a cheese-covered, chocolate-filled pretzel from that one dive!!!

Here’s a tale of two dives for those of you who worry about what dove planning software has to say. A thing to know about the rule of 130: at 60 feet things go wonky… from 100 feet on up it adds up to 130… but then at 60 it jumps from the expected 70 minutes Of no deco to 100 minutes of no...

This exception… a solid quarter of the population have a PFO. Which means one in four divers have one. A minority… sure… but a pretty strong one. The vast majority of them don’t cause problems. Staynong class to No deco limits obviously helps. Hydration. Not jumping right into the hot tub...