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I have what I think is a Cornelius compressor with a gas motor. I will never use it. If you are interested I could try to find model numbers.

The Oceanic's I have can be set to not go to 50% for MOD purposes.

And there is the nitrox course in a nutshell.

This is my assumption. If I go up to a stranger and ask for air they will give me air but then they will be looking at my gauges, and looking at their computers and heading for a safety stop. There will not be someone swimming from diver to diver borrowing air unless they all know what is going on.

I am in full agreement. But for a new diver looking on it would be hard to tell. An experienced diver would note the lack of concern.

Nope, but consensual is where I would draw the line. And I suspect that everybody who shared air in this incident was in on the game.

Please explain why chronic, casual, consensual air sharing is a bad thing? People looking on, as the OP was, do not have a clear idea of what is happening. I'm not talking about OOA. The OP assumed that the diver receiving air was OOA, simply because they were sharing air. I am confident, from...

So you think it is bad to be good at sharing air?

I am OK with it, if the people involved are OK with it. People looking on may not know that the people involved are in on the game.

Who said she was a stranger to them?

Where did it say she would hold her breath? You are making things up.

Then they separate onto their own regs and go to the surface.

If it was an instabuddy, yes. Do you see evidence that it was? I'm sure new divers have watched us and thought the same thing, but they are jumping to conclusions.

"I didn't notice until about the 3rd dive but one diver would start sharing air with her buddy towards the end of the dive. Then the diver started jumping from diver to diver to share their air until we surfaced." Do you see anything that says the diver was OOA?

I am not trolling, I am 100% serious. Can you answer?

Once again, why would sharing air when the receiving party is not out of air cause a problem?

Yes

You realize that we are not talking about an OOA situation? What is dangerous about sharing gas when you are not OOA? A friend we dive with used to use a lot of air. Really lots. My wife uses almost none. They would often share air and I also would share air with him on occasion. My guess is...

I would make the argument that sharing air in a non-emergency situation is good practice. Of course....you cannot just come up to someone who isn't already in agreement and continue the dive using their air. And you can't wait until one diver is really low on air. But I see no safety issue, and...

So long as the big breather doesn't run their tank out before sharing and so long as the other divers are good with it, why does it matter? Why would it be unsafe?