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I'm not sure I follow why you would need to swap valves, or O2 clean the dil cylinder. Unless they mean adding different valves that are not inline valves. Regardless, it already seems a bit confusing already. Many thousands of hours have been done with standard config JJ's in wetsuits, well...

I don't recommend inverting the cylinders just for this, nor changing which side is your oxygen. The trim issue can be reduced enough on its own without reconfiguring the whole design. If you're a large and strong person, maybe consider the 'heavy' manifolded twinset dil monster config, as...

Try a less dense fin, like the non-dense version of the Apeks RK3, and a buoyant bootie, like 5mm or even 7mm with a proper thick sole. I once used a ScubaPro Go fin and just sized it up. A carbon backplate lightens up the whole rig. You could also try a 'travel stand' for minor improvement...

Honestly none of these individual details explain or prevent this accident. It's going to be Human Factors. A lot of heroes, very talented experienced people have joined the ocean and not come back. Many of them knowingly doing things beyond accepted limits. Best if someone--ideally...

CO looks 'fine' (much below 10 ppm). The CO2 in the 50% probably wouldn't be noticeable at deco depths ≤20m ('1800ppm' equivalent at 3x pressure?). Might be common in nitrox membrane systems that concentrate heavier ambient gases (O2, CO2, argon) Is there any precedent for deep commercial/sat...

What were the divers carrying for bailout? Sometimes on deep dives we connect the BCD wing to a separate small air fill bottle. Other times, connected via LPI whip to the cheapest bailout gas, e.g. the 50%. That way valuable or limited trimix diluent is spared.

Thank you for clarifying, had missed that this was the surface interval afterwards. I guess this is partly why it can help to have support divers or additional crew along to assist in aggressive diving plans. Someone prepared for this might have been able to maintain airway and buoyancy for the...

I'm talking about the possibility of accidental hypoxic diluent addition after reaching the surface. Unlikely? But possible. Nothing to do with the dive profile, which (as posted above) does not include data on the surface, or afterwards. Was the unit/computer switched off upon surfacing...

If the cause of injury were acute DCI due to an ascent from bottom that was too fast, how does this explain the apparently controlled deco stop in the dive profile? Would you not need to assume then that the diver was already experiencing DCS on this deco hang, resulting from the ascent? And...

On a recent Offgassing podcast Neal Pollock said something about younger people having fantastic skills, but reduced awareness of hidden dangers, especially decompression injury. Freedive experience/training could exacerbate this, for someone who has built up habits for repetitive bounce...

So they say you shouldn't do any freediving after SCUBA diving, because the very rapid depth changes of an extreme bounce to depth and back is like shaking up a carbonated beverage. More bubbles than you expected. Have heard accounts of this being real; has it killed anyone? I guess some are...

Cool tips @grantctobin about relative weights and the clearability of the male QC6 fitting on the cylinder side. 👍🏼 These pics really help to see how people are doing it. With a BOV that connects on the left, I started out just short-plugging without going over a shoulder etc. Just open water...

I have the shorter length of hose on the BOV side, with the male QC6 fitting. A bit shorter than the corresponding section of corrugated loop hose. That way removal and cleaning of the BOV/loop package is kept convenient. Very convenient to just flip over to a full cylinder of ideal bailout...

Probably genetic factors, but most can adapt through repeated experiences. Probably some crossover resistance also from cars, carnival rides, swings, substance abuse, etc, but no guarantees. You can get used to one kind of motion, say a specific boat or boat type, but then a new one can get you...

In that case, what happened to the millions of dollars? Untraceable? And how much of that sum, annually, was effectively paid out on behalf people (or their providers) who called the DAN Hotline in the case of injury? If it amounts to premiums on outside insurers, what is that number? Let's...

You can make any standard fin work for snorkeling, by adapting technique. But a semi-flexy fin seems easier. Neoprene socks or booties strongly recommended for entries/exits, or blisters. For actual swimming--usually with a mask/snorkel for me--the more I swim, snorkel, paddle, and surf over...

Several mixed experiences with DAN have been voiced here. Yet, hundreds of thousands (?) of us continue to support DAN.org, based on reported positive experiences of injured divers being promptly supported by calls to DAN Hotline. Without real statistics, it is impossible to understand. So...

It's a shame how much confusion arises without any data. Triple dives to 60+ metres on "10/20" with GF 90/90 This may be on the edge of survivable, even without any [other] mistakes?

Finally some real data here, that could save more diver's lives. 🙏🏼 The diluent says "10/20." Possibly a lie to the computers to avoid helium penalty (?) What was the actual diluent? Triple dives to 60+ metres with GF 90/90 (on "10/20") is hyper aggressive. Did they consider gas emboli...

What is the "What?" If you are on a CCR--at the surface--the minimum percentage of oxygen in the loop to avoid having to worry about hypoxia is--OFFICIALLY--40%. A.k.a. a ppO2 of 0.4. But 70% is safer. And you can easily abide by this on hypoxic diluent, or even a pure helium diluent, by...