I don't know John. I am aware of some appeal in going deeper than most, something of an extension of us swimming where the vast majority never do - below & for an extended time, and I think the three were somewhat experienced below 130 - maybe in the 200 ft range. I am also curious about what is at 250 ft, what's different, any black coral left by the poachers, etc. I am no longer interested in going to 200 as I was years ago, but there is appeal.
I call it the "
deep bug" and when it bites you watch out. I have seen many divers bitten by it, mostly men, very few women. I was bitten a few years ago, and there is that "appeal" you mention, the "lure of the deep" I think many divers here have probably felt it, and it can be dangerous as this situation proves. I did a very stupid dive many years ago, and fortunately got it out of my system after realizing just how lucky I was that an o-ring or hose didn't decide to quit on me during the dive. The deep bug has claimed many divers over the years.
At this time (pre-wilma) I was diving regularly and in much better shape than I am now. I was bitten by the deep bug and also curious about narcosis, as I had never felt it, I thought. I had been down past 100, and 130 and no narcosis, and I saw some folks were narced at 100. I would later do some light research on this and found out that having a high adipose content in your body (bio-prene, fat) as I do, means that a certain amount of nitrogen gets lodged inside the adipose tissue, and thus you have less nitrogen in you blood stream going to your head, while the very thin and skinny divers with little or no adipose have all the nitrogen in their blood stream, going to their head, thus I found my answer of why I wasn't getting narced at 100-150 while others were. This also means that it takes longer to offgas.
We each have different chemistry and react differently to the additional chemicals in our system when we dive, body fat, Ph, tolerance/experience to states of euphoria, etc. All of these affect how we each react differently to being narced or not.
I continue to hope and pray that these 3 divers make recovery and are able to return to some normality in their lives, this event indeed should be a lesson for all of us.
And it should also be repeated
over and over that regular divers doing regular profiles are not in danger of being swept down to 300 feet, and Cozumel is and will continue to be a safe dive destination, as long as divers follow their training, and don't break the dive rules they learned when they got Certified.