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Many of the cave diving videos on YouTube will be illustrative. You can hear and see them breathing. A frog kick also promotes low air consumption, as it has a glide phase.

10 seconds per cycle is still very good, assuming a 2 liter inhale. That said, most new divers flap their arms to turn and are trimmed like a seahorse (substantially head-up). That trim means they must be negatively buoyant so their diagonal oriented kicks don't decrease their depth. They must...

I don't either. Nuvair says, "water resistant", whatever that means -- no IPX rating is given.

I would not add weight to allow multiple breaths. Either get a smaller one for pool training or just accept that it won't be full. One option that you may see is to use an inflator hose. I'm not a fan of that approach, since you're pretty committed. Once started, there is no good way to delay...

They're not usually waterproof. Most people use a dry bag for their phone, wallet, towel, jacket, and the analyzer would fit right in. That said, I've never had a DM try to dunk my bag.

An LPI adapter for the analyzer is certainly nice if tanks are being provided. Put your reg on first thing to quickly get both pressure and analyze. I've had more under-pressure tanks than a bad nitrox fraction (fortunately zero of those).

With my AL plate and AL80, I use weight in 2 trim pockets on the upper cam band (right against the plate) and two trim pockets on the waist belt (also against the plate). Very stable.

A plug seems pretty cheap insurance to me.

Lol, it also says that doing so "may compromise" the safety of users. Kinda like driving more than 0 mph may compromise safety. There are some risks I am willing to take. YMMV.

Do you already have a computer and wetsuit?

I like the Palm analyzer. Fairly compact and easy to pass around to neighbors.

Hand truck & bungee to prevent tipping

Artic is warmer. I've been told in the past that the Artic is about as warm as 200 gsm Thinsulate.

You won't get much info, since equipment dictates required lead far more than body composition. At the end of the day, to be neutral the negative things must balance the positive things. Common negative things: lead, backplate, steel tank, regulator, fins, reserve air. Common positive things...

@LFMarm, I thought the XVAL tables were for heliox. Are you aware of any evidence (either way) about using them on trimix?

My understanding is that the M-values were originally set with the intent of equalizing risk. Faster tissues (those with greater perfusion) can tolerate higher tensions without issue, for example, and we see this reflected in higher M-values. However, when the researchers in the field today run...

If you're neutral with empty tanks & wing (I think you missed that part in what I wrote), you absolutely will be negative by the amount of gas in the tanks when they're not empty. The 2-step process eliminates the effect of the wing from your trim, making for a simpler process. Once you have...

Claude didn't even get this one right. Pretty sad.

It sounds like you're somewhat arbitrarily moving things around hoping to land on a good combination at some point. You might consider a 2-step approach: 1) arrange for good/stable trim with near empty tanks and empty wing. Move lead, shift tanks, etc., all while still being able to manipulate...

Enjoyed the vids and the writeup. Thanks for all the work you and the team put into this project! (Small nit on the writeup: flow is ~3000 gal per *min*.)