There is a different word that use to be used too...
Additional measures beyond analyzing, labeling, and notox procedures to help prevent incorrect deco gas switches
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eightytwenty
Contributor
Do you mean to say a HUD for each 2nd stage?
At risk of diverging a bit from the thread topic — how do you imagine this? Probably with some analyzer on the reg2nd/HUD combo to confirm MOD?
Given infinite resources/engineering capability I do like the idea
flymolo
Contributor
Open circuit gear is just too simple we should find a way to put galvanic oxygen sensors in it
eightytwenty
Contributor
Okay then, I read through the thread, embarrassed to find I was active in it but did not immediately recall it.I tgink it was blue hole instructor fatality — I’ll find the thread and edit with link
Error - Blue hole fatality
I came across a post on Chinese social media called 小红书 , but I couldn't find any corresponding reports in English-language news sources. According to the post, it appears that a Tech instructor was leading a group of students on a technical dive to the Dahab blue hole in Egypt. Tragically...scubaboard.com
TLDR: instructor switched to/ has been using deco gas at depth (arch, 56~60m)
The big discovery in this thread, if you go almost to the end to find it (post #48), is that evidently there was no switch to an incorrect gas on this dive. The diver was supposed to start the dive breathing from an air cylinder but instead started the dive--right from the surface--breathing his deco gas and continued with it to the bottom.
This is consistent what I said earlier in that thread--in almost every case I know of a diver toxing because of breathing an incorrect gas at depth, the problem actually occurred on the surface, usually because because of mismarked contents, and not because of a faulty gas switch at depth.
Follow DIR gas switch procedures.
eightytwenty
Contributor
That would be too sensible
I am a lazy, cheap hypocrite for sure.
We used to joke about "Sportechincal" and "techmix" diving. We still do, but we used to also.
Helium is so expensive on OC that the gear is a minuscule expense.
Yeah, like maybe? Can't solve a skills issue with gear.
The CCR has a HUD with lights, but that is too complicated.
I imagine a depth gauge with two lights
- zero lights = unit is off
- one light = unit is on but the depth is outside the set limits
- Two lights = unit is on and the depth is inside the set limits
But seriously, assume a twinset with bottom mix, an AL80 with travel gas, AL80 with 50% and AL40 100% O2
That is not too many tanks to handle, but we see bad things happen. Task loading, ego, complacency, ego, fatigue, ego, communication breakdown, ego, denial, ego, hypothermia, ego and evenluck can all play a role in the accident chain of events.
Booth's law:
"The safer skydiving gear becomes, the more chances skydivers will take, in order to keep the fatality rate constant."
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