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I've always found it ironic that one can teach the PADI Self Reliant specialty with a Tech certification (and logged dives & instructor ticket of course), but that same Tech cert would not satisfy an operator's requirement for an individual dive. (I know, insurance policies are what they are.)

The Duke study negates this argument, as people were still getting bent with a surfGF(8k) of a mere 20% -- far below what we believe to be safe enough when exciting the water. There is clearly something else at play. My opinion is it's due to the asymptomatic bubbling that we now know is very...

Yes, because ambient pressure is reduced. I don't consider the rate to be an issue -- even in an airplane -- as it's well below the pressure equivalent of 10 msw/min or 30 fsw/min. Granted, there is additional time for off-gassing during a slow ascent (as when driving), but that's a race...

Yes, but I'd say calling them chamber tests isn't quite right. The dives were real, [Edit: I checked again, and they were chamber dives. Thanks for the ping, @tursiops. I mistakenly confused the DSAT NDL experiments with the Duke study.] and the "flight" was conducted in a chamber to reduce the...

Your SurfGF is a decent proxy for tissue loading, and at sea level it is perhaps 1-2% at that 8 hr mark based on that graph. However, at the 8000 ft equivalent pressure altitude for most commercial flights, surfGF goes up because it's based on the ambient pressure. In the Duke study previously...

The shop should tune it with your preferred/installed mouthpiece to NOT free-flow when the adjustment knob is all the way out. This gives you room to adjust as internal parts wear. As others have mentioned, I suggest you take it back to be properly serviced. (It's pretty quick to adjust.)

To clarify for the OP, this is talking about the case when you have lost the wing AND had a major suit flood. In the more likely scenario, there is only one failure, and you can use the other to compensate.

Yes, "top of the knob turned away from you while in your mouth" is "open". That's backwards. Fully clockwise (looking at the end of the knob, i.e., "closed" or "screwed in") is the hardest to start the flow, useful for entry and on the backup regulator. In normal operation, open it to make the...

Actually, it just requires a length of bungee from one of the holes in the edge of a normal backplate. I do that with my backmounted CCR BO for better streamlining, less chest clutter, and zero movement when kicking. The tank has the standard stage rigging for getting to the water, but it's...

Perhaps some useful info here: https://scubaboard.com/community/threads/sdi-open-water-sidemount-tdi-sidemount-difference.472723/

I wonder if there's any rotational torque at all. This was stated above (emph. mine):

Opposite the valve opening or valve handle? (Should be the latter.)

If the odds are not a clean kill, don't shoot. It's as simple as that. Continue this habit and at some point, you will be sorry. (You'll either be taken for a ride, lose gear, or get wrapped up (and maybe sliced) when the fish comes at you rather than runs away.)

You don't seem to understand the wing compensates for the *change* in gas weight (and wetsuit if that's being used). Yes, you'd need more lead, because an empty AL80 is a couple pounds positive -- but that lead makes you neutral at the end of the dive at reserve pressure. That's the exact same...

You should understand many people use sidemounted cylinders in cave diving where the flow is severe enough to require a rope in some sections. A sidemounted AL40 would be quite innocuous. I would absolutely pick that over independent BM twins.

Turn the adjustment knob down for entry and open it when it's in your mouth.

I've booked direct with Iberostar (website, not the physical hotel) and got the pool view I wanted. (The shorter walk to the pier is nice for diving, but it's a longer walk to breakfast, so meh.) Booked the diving (and a free AOW cert) on the Dressel website. Paid via CC. An email from Spain did...

Between Teric & Tern Tx, I think it comes down to whether you want to use trimix or have backup deco calcs for a CCR. I've seen some used Terics for almost what a new Tern Tx goes for, but I get that you're on a short timeline. If you're uncertain about the need for trimix someday, I'd say...

Yes, in watch mode the Teric display can be configured to wake up with wrist movement the OP's question. The blanking can be delayed by up to 20 minutes without movement. (Implemented in a 2021 firmware update, BTW.) Are you looking for an Always On mode? That can be effectively achieved by...

In that case, I'd say start dumping sooner and more often. Think about it: the suit buoyancy is the same when the vent stops venting, so just keep it at that point for the most part. Initiate ascent with a larger breath, keep the suit venting, and let the wing volume drive the ascent . Blip the...