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I don't think I've ever seen a diving-themed mainstream advert that doesn't feature, towards the end, a shot of the divers swimming vertically straight towards the surface, usually using a big-ass flutter kick. (I would guess it is to reassure the general viewing public that they weren't...

So I was interested enough to run some numbers; looking at, for example, 30 minutes @ 90m (300 ft) with standard OC gases, with (unmodified) Buhlmann 20/85 I get 66 mins on oxygen. Doing 12 mins on, 6 mins off on 12/65 trimix for a total of 66 mins on oxygen without counting gas breaks as O2...

I would see that as, "the pulmonary benefits from taking breaks keeps off-gassing as efficient as possible" rather than the breaks make off gassing more efficient somehow. I would also agree that there is some level of off gassing (at least in some tissues) still while on back gas, but I would...

Interesting - I don't know anyone who does count gas breaks as deco time any more. I thought that was one of the Georgisms that had long since been quietly dropped. Was there ever any actual evidence for the "your body acts as if it is still on oxygen" thing?

Seems quite possible that a computer would give that result for some profiles. I just ran 75m for 30 mins through Baltic; 40/80 first stop 42m, run time = 146 mins 5/80 first stop 51m, run time = 162 mins (16 minutes longer) GFLo 5 is the lowest I can go in Baltic, but 75% max depth would be...

(Removed - my point already been made by others.)

You can't directly compare the 'focal length' of a fisheye lens to a rectilinear lens. A fisheye lens will have a much wider angle of view than a rectilinear lens with the same 'focal length', due to the (designed in) distortion of the fisheye. However, to complicate matters further, a fisheye...

It's like speeding. i.e. anyone going 10% faster than you is a reckless idiot endangering everyone on the road, anyone going 10% slower than you is a loser who should learn to drive properly. Anyone doing dives more than two levels above your comfort level clearly has a ridiculous death wish.

My most recent example was adding banked nitrox 32 to trimix - not particularly slowly. The analysis was still different after shaking the tanks.

Yes, but the thing that is utterly counterintuitive to me, is that filling doesn't create sufficient turbulence to create homogeneity, but shaking the tanks about a bit does.

Agree - I wouldn't have believed it if I hadn't witnessed it myself. Helium pumped on top of trimix, then persistently and thoroughly analysed at something like 8/75. Tanks rocked and shaken, then analysed spot on at 18/45. When the gases are thoroughly mixed, they won't then stratify out...

Thanks for the link David! I'm interested in trying to code up an implementation of this model; mostly for personal interest. Before I start reading, can you say off the top of your head if the paper includes everything necessary to create a complete implementation? Also, are there any...

...Gotcha. :) Couldn't remember the appropriate tags.

Here is a contribution (in Python) towards a Buhlmann/GF project: Note: This is NOT a full implementation (My planner doesn't implement GF stops in a conventional way, so someone else will have to come up with a way of allocating stops), but some key variables and formulas towards an...

I use the Buhlmann part of Decoplanner (when I can coax it to work on OSX), the Buhlmann part of Baltic on iOS, and a Buhlmann/GF ratio deco planner I wrote myself. I've written a few Buhlmann implementations over the years, writing one yourself is the only way you can be entirely sure what...

Hi Ross, Sorry, maybe my question wasn't clear, I wasn't looking for more declarations of how strong your devotion to VPM is or accusations of conspiracy, I was just asking for a simple explanation of why a profile is fabricated nonsense at one bottom time but suddenly becomes A-OK for a bottom...

Hi Ross, can you explain how a profile is fabricated nonsense at one bottom time but suddenly becomes A-OK for a bottom time ~20% longer?

I was curious about how a VPM-B+7 profile compares to a VPM-B+5 profile for the same depth with a slightly longer bottom time. (VPM-B+7 profiles for 20 and 40 minutes at 300ft are taken from UWSojourner's post here: Son of Deep Stops *or* Waiting to be merged with the mother thread... and...

Thanks Simon and Claudia, lots of reading material there. An immediate observation (...relevant to the distinction between causality and correlation), the most consistent strongly significant difference between the bubble prone and resistant groups (- the only factor significant at >p0.01 for...

Simon, I realise the decompression stress paper wasn't yours, but do you know any way I could find more information on the correlation between blood cholesterol and being bubble prone? (As a technical diver with Familial Hypercholesterolaemia (under treatment) this is highly relevant to me...)