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Talk to your insurance agent. Some amount is automatically covered. Something like a $10k DPV or CCR probably exceeds the built-in amount.

Correct, I did not know him, but I hold him in very high regard, as do many. However his story (in the pdf I linked) about his buddy passing out while just swimming along is plain sobering. The fact they were in an overhead environment is immaterial to that. As is the increased narcosis due to...

The CCR BO is 1.5x after a major failure. The OC is 2x before a major failure, but possibly only 1x after that failure (assuming SM). ETA: yes, losing both a reg and DPV is 2 majors, but you are solo...

For that altitude, ocean equivalents are ~21% deeper. 50 ft fresh water would be equivalent to 50*1.21=61 ft sea water. Safety stop at 12 ffw at altitude would be equivalent to 15 fsw. The drive after the dive is a consideration, but the shop hosting the dive should be able to give you an idea...

Amplify your desired Safety Factor considering the different speed/consumption values each way. (The principle behind Thirds is to have a Safety Factor of at least 2x the gas needed to return.) You just have to do the math to make that happen. Your example would need to amplify the safety...

Never said it was, but having done all 3 options being kicked about, I believe OC air to be the least safe for me. YMMV, of course.

I found an article he wrote in 1991 for AquaCorps to be quite informative informative. Linked and another quote:

Obviously, you don't. Good luck getting the average diver to a) be aware they fall short of objective standards and b) know an efficient path to improvement. I'm not saying GUE is the only way to improvement. But the odds are high that someone will improve with them. (@estresao's unfortunate...

Your post is analogous to saying a critic of Russian roulette was killed by a mugger, therefore his criticism of Russian roulette is bogus. How Wes Skiles died is irrelevant to his stance against deep air.

Deep diving on air must be approached with a strong sense of the possibilities of uncontrollable circumstances and negative outcomes... There is no such thing as getting “good” at deep diving on air. While a person may be truly competent, their competency will only allow them to be lucky when...

Prefer normal #s (one hand) for the hundreds (2100 psi is two-one). I'm only ever asked when on guided rec dives, though, so I try to respond as directed to avoid confusion.

I use the thumb for normal/casual exit. If doing several passages (e.g., spoke pattern), I'd use a circle to end the current spoke. If a hasty exit is needed, follow the thumb with an emphatic arm pointing motion as in "get the hell out NOW".

Exactly so. Sad that such measures are needed, but the world is what it is these days.

True, but we don't ascend from a mandatory stop based on TTS. It won't change the stop depth until tissues are able to tolerate the next depth, and tissues are calculated with the currently active gas. OP, my apologies for straying from your NDL scenario (although that is an assumption on my part).

This is incorrect if you actually mean "available" rather than "active". (Various posters above have conflated those two terms.) There is zero issue having various gases defined & available (i.e., ON in the gas menu) on an NDL dive, and it is quicker to select your single gas from the...

Mistake somewhere. Density of freshwater is 1 kg/L. 21.3 lb is 9.7 kg, so 9.7 L volume. Which works out to... 21.3 lb, oddly enough. 🙂

1250 g with inflator, no tank bands. Another 580 g for 2x Aqualung Griplock bands and 2x DGX trim pockets.

My experience is a much greater tendency to fog a mask on the front as my forehead warms/humidifies that air. In rougher conditions, on the face is the best place (preserving vision), or possibly around my neck.

Crotch strap makes the waist strap "V" down a bit and stabilizes everything. With your index finger on your belly button, the top of the crotch strap would be at or just below your pinky finger.

Yep!