Vessel Divers Searching Sunk Superyacht- Sicily

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It is oh so easy to be an "armchair quarterback" (since this is a global forum, for those not familiar with the expression it's an idiom that comes from North American football that refers to someone sitting on their couch at home criticizing the plays made by the quarterback during the game that they are watching). And full disclosure, with this incident I did it myself...

To be clear, at the time of posting this I do not have even 50 dives in my logs, and am not Nitrox certified. And even still, even still, with my limited experience, when I saw a photo of what I now know to be a member of the Italian Fire Brigade entering the water with a single 15L air tank, my first thoughts were "Why aren't they using nitrox for that depth? Surely they must be using nitrox. Maybe they label the tanks differently in Italy?" Such a fool am I...

Speaking only for myself, thank you @Angelo Farina first of all for what appears by my count to be nearly 40 years of willingness to serve as a firefighter - something that fewer and fewer people are willing to do these days, at least in many parts of North America, given the difficulty and risk level of the job and the incredibly poor remuneration (in terms of salary and benefits, that is). And for seemingly some part of those years - well, it takes a special kind of diver to be willing to use your diving skills for body recovery work, regardless of the conditions... so, simply, thank you.

But thank you also for providing so many details on the workings of the Italian emergency response system - even at the risk of exposing both yourself and the Italian Fire Brigade to even more criticism from afar. It helped me to give my head a shake and remember not to be too judgmental about a system that I really don't know anything about. I should know better, living where I do which is so far away from where I was raised. But being an "armchair quarterback" seems to be built into my DNA...
 
To be clear, at the time of posting this I do not have even 50 dives in my logs, and am not Nitrox certified. And even still, even still, with my limited experience, when I saw a photo of what I now know to be a member of the Italian Fire Brigade entering the water with a single 15L air tank, my first thoughts were "Why aren't they using nitrox for that depth? Surely they must be using nitrox. Maybe they label the tanks differently in Italy?" Such a fool am I...
They're using 21% Nitrox

Highest percentage for a 50m dive would be 23% at a PO2 of 1.4 so makes no difference and as @Angelo Farina mentioned they are doing deco on the ascent.

As we are not privy to the actual practice of this team doing the recovery, we can only assume certain aspects of how they are managing this situation.
 
I'd much rather be rescued by a first responder diver with a single 15 litre containing air than be recovered by a trimix rebreather cave diver days later.
 
+ And even still, even still, with my limited experience, when I saw a photo of what I now know to be a member of the Italian Fire Brigade entering the water with a single 15L air tank, my first thoughts were "Why aren't they using nitrox for that depth? Surely they must be using nitrox. Maybe they label the tanks differently in Italy?" Such a fool am I...
Nitrox is way overrated. Here in the Med, we consider it useful only for a limited range of depths (say 25 to 35 meters, which is NOT our favourite depth range, the best is either shallower or deeper) and when doing repetitive dives in a day. Which, again, is not so common: we often prefer a single deep and good dive in the morning, seeing red coral, lobsters, paramuricee, and the other things you only find below 45m-50m, followed by a good lunch at the restaurant, and spending the afternoon doing other water sports or simply relaxing...
I never understood people doing 4 dives per day, shallower and shallower, because they fear anxiously to have to do any deco stops...
So Nitrox is not widely employed here, as instead it appears to be in the Caribbean area. I am NOT Nitrox certified, albeit I am certified for CC recreational rebreathers... I can even use pure oxygen!
I am not tech certified, either...
I fully understand how this can sound strange for people used to different systems, and diving in different environments.
Speaking only for myself, thank you @Angelo Farina first of all for what appears by my count to be nearly 40 years of willingness to serve as a firefighter - something that fewer and fewer people are willing to do these days, at least in many parts of North America, given the difficulty and risk level of the job and the incredibly poor remuneration (in terms of salary and benefits, that is). And for seemingly some part of those years - well, it takes a special kind of diver to be willing to use your diving skills for body recovery work, regardless of the conditions... so, simply, thank you.
Well, I was in real service as firefighter just for one year, in 1984, plus two short periods of one month each during a couple of emergencies (a big snow fall and an earthquake).
For the other 40 years, I remained in a quiescent state, ready to be recalled, but not in service. For many of these years (the first 15) I was indeed also an expert in body recovery in the Civil Protection, being an active member of the local diving club, Parma Sub.
And I had to conduct several body recovery operations (a dozen, more or less), and more than 20 reharsals - test operations. During one of the real operations I was the diver effectively finding and recovering the dead body in a river (a 7-years old child, really a sad story).
But, as explained, volunteers operate very differently in Civil Protection than professional firefighters.
Then I had sons, the work demanded more time, so I retired as body recovery expert for muddy rivers.
Only in 2007 I returned in the Civil Protection as a volunteer, but now with a very different expertise: I had two Golden retrievers, I trained them for search of trekkers lost on the mountains, with the specialty of conducting the dogs from a motorbike (actually a Vintage Fantic Trial). This activity was organised by a motorbikers club (Motoclub Crociati Parma).
The specialty of motorbike + research dogs is quite unique in Italy: we were only 4 volunteers with this specialty. This allows to cover a much wider area in shorter time, and, under favourable conditions, to carry the lost person back to a recovery point, as our vintage trial bikes are equipped with a long and comfortable seat and are homologated for driver+passenger (standard trial bikes have no seat and are driver-only).
Here you see my collection of vintage Fantic Motor trial bikes:
And here you see my Golden Retrievers Argo and Penny (now defunct, unfortunately):

Sorry for having derailed this thread to my personal experiences, which are completely OT.
But this is Scubaboard, I see that these derailings are quite common, and moderators tolerate them...
I love Scubaboard also for this!
 
https://www.shearwater.com/products/teric/

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