How much air to surface with?

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Diving Dubai:
Surely the real answer to how much air should be left in a tank at the end of a dive is 42?
Click to expand...

If those are PSI, I'd avoid it. Bars you're fine, bars are always fine.
 
Patoux01:
bars are always fine.
Click to expand...
Both types of bar(s) are fine.
 
What post as this in response to? The answer as it is with out a reference raises too many flags.

Diving Dubai:
Surely the real answer to how much air should be left in a tank at the end of a dive is 42?
Click to expand...
 
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