How did old-school deep air divers avoid ox tox hits?

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ianr33:
In "Caverns Measureless to Man" Sheck Exley seemed to use 2.0 routinely. The times they have a changed.
Click to expand...

We learn more, so we change, thanks in part to these guys and others like them.
 
They dove the Britannic on air in the 1976 expedition. I must have mistaken it with others.
 
Jared0425:
They dove the Britannic on air in the 1976 expedition. I must have mistaken it with others.
Click to expand...

No, they used Heilox, I just watched it for the 4-5th time a few weeks ago.
 
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