I think the credit for the 120 rule goes to the US Navy


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Posted by TDI_2 on May 08, 2002 at 15:10:31:

In Reply to: The 120 rule posted by TDI_2 on May 08, 2002 at 15:02:54:

But I learned the 120 rule from NAUI.

Anyway, today, in modern times, GUE is popularizing the 120 rule for EAN 32 dives to less than 100 fsw. They also teach that if you go deeper than 100 fsw you should be on trimix.

Most of my friends think trimix shallower than 185 fsw is a waste of precious Helium, but GUE is very conservative.

Air diving depends on who you dive with. Some clubs hate using air. Other clubs love it because it is easy to get. To each his own. Whatever floats your boat.


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