What happened to Cozumel?

[ChrisM]

He just said "multiple" tanks in the morning in addition to an evening dive. There are enough scenarios I could think of where that lackadaisical attitude could bite you in a permanent way where I would never want to dive with a person with this mindset, or witness their death by just being on the same boat.

If I had that mindset and practice for 10 years of diving and then do a liveaboard and do 4-5 dives a day every day for a week spaced in a way to never really get back to "0" while not having analyzed a tank or understood the CNS clock (for the last decade) because "rules dont matter".... See where I'm coming from? Maybe it's overly cautious but it's easy enough to analyze a tank it's stupid not to.

I just know that Coz boat diving is two a.m. dives.

Like I said, it's a best practice, normalization etc as discussed above, and if you're on a liveaboard and don't analyze you're an idiot unsafe diver and I have no sympathy for your chamber ride. That's not what is being discussed. Do I analyze every tank? Other than the last trip, yes for the last 25 years (liveaboards actually require it, at least the ones I've done). But again, you dove without analyzing, so maybe glass houses and all?

We're also always told first drink ends your dive day. I do not think I've ever had a beer and then dove later in the day as i just don't drink that early, but would i dive two hours after 1 beer? sure.

 

[ggunn]

He just said "multiple" tanks in the morning in addition to an evening dive. There are enough scenarios I could think of where that lackadaisical attitude could bite you in a permanent way where I would never want to dive with a person with this mindset, or witness their death by just being on the same boat.

Here's what I actually said: "I don't dive deep any more, I don't get into or even close to deco, and mostly I dive only a couple of tanks in the morning. I may do an afternoon or evening very shallow shore dive or a boat night dive at a shallower site." By "a couple" I mean "two", and in the course of a two week stay on Cozumel I normally dive 9 or 10 two tank mornings, one night boat dive, and 3 or 4 shore dives at 15 - 20 fsw max.

If you want I can let you know when I will be on the island and with whom I will be diving so that you can avoid being on a boat with me ( ), but I can tell you that if/when you next dive Cozumel you will more than likely see lots of people diving nitrox tanks without analyzing them.

 

[StreetDoctor]

I just know that Coz boat diving is two a.m. dives.

Like I said, it's a best practice, normalization etc as discussed above, and if you're on a liveaboard and don't analyze you're an idiot unsafe diver and I have no sympathy for your chamber ride. That's not what is being discussed. Do I analyze every tank? Other than the last trip, yes for the last 25 years (liveaboards actually require it, at least the ones I've done). But again, you dove without analyzing, so maybe glass houses and all?

We're also always told first drink ends your dive day. I do not think I've ever had a beer and then dove later in the day as i just don't drink that early, but would i dive two hours after 1 beer? sure.

If you read my post I even admitted how wrong it was. At this point I think we’re past only talking about Cozumel diving. Oxygen toxicity isn’t going to get you a chamber ride it’s most likely going to get you a seizure underwater and a casket.

 

[BRT]

If you read my post I even admitted how wrong it was. Oxygen toxicity isn’t going to get you a chamber ride it’s most likely going to get you a seizure underwater and a casket.

Multi-dive oxygen toxicity and exceeding MOD seizures are very different things. Go find or steal a copy of "The Oxygen Hackers Companion"

 

[ChrisM]

If you read my post I even admitted how wrong it was. At this point I think we’re past only talking about Cozumel diving. Oxygen toxicity isn’t going to get you a chamber ride it’s most likely going to get you a seizure underwater and a casket.

We are generally on the same page, or at least experienced enough to be aware when we are doing something squirrely and that we ought not to do it. But IMO ox tox is virtually impossible given the diving we're discussing here.

Seriously if ox tox were such a danger, why don't we test air tanks? They would theoretically be even closer to the risk for ox tox than an EANx tank. But we trust that compressors are adequately maintained and the way they operate, it's impossible to introduce too much 02. The membrane system is no different. But we decide as a policy that we will test the latter and not the former. And the primary reason we do that is for N loading. But we are also now concerned with PP02 because we tend to dive longer and deeper with EANx than we do with air (and our MODs change), thus increasing the PP02. But if you don't dive deeper and longer, then you are not increasing the PP02

I am surprised that you have found yourself riding the 1.4 line. 30 years, 1100 dives, probably 10 LAs, I haven't even come close (and we can even set our comps to 1.6 and still be safe)

 

[ggunn]

We are generally on the same page, or at least experienced enough to be aware when we are doing something squirrely and that we ought not to do it.

Of course, and if I were getting anywhere remotely near the danger zone for O2 tox I would be testing O2 content and setting my computer for it, but I'm not. My computer shows a slightly higher N2 loading than it otherwise would, but I am OK with that. I stay at the SS a little longer than I have to in order to get out of the yellow, but that's OK as well.

 

[ReefHound]

Not knowing exactly what you are breathing is never acceptable and you sound like a liability to everyone on the boat with you.

That's everyone who dives air. Are you saying every diver must analyze every tank?

Did you analyze for CO? That's part of knowing exactly what you are breathing.

 

[ReefHound]

Pardon my hostile response but it’s not really my position to educate anyone here on this.

And yet you persist in doing so.

 

[StreetDoctor]

That's everyone who dives air. Are you saying every diver must analyze every tank?

Did you analyze for CO? That's part of knowing exactly what you are breathing.

Does your open water cert say you need to analyze air or is routine compressor maintenance good enough? Are they mixing your air?

 

[ggunn]

And yet you persist in doing so.

Let it go. If he wants me to tell him when I'll be diving Cozumel and diving nitrox as air without analyzing it so he can avoid being on the same boat with me, I'll do it.