You make interesting points ... as I see it, gas (mainly O2)
in  caves  could be considered as a pollutant if it disolved
into  the  water  ... it may change the abundance or plainly
kill  fungi,  bacteria  and  other organisms in the cave ...
many  of which might be endemic ... this may be an important
issue  to  the  DIR framework ... which, hopefully, may take
into account environmental issues in the future.

cheers,

aldo.solari@ho*.se*
www.ccbb.ulpgc.es/fish-ecology/solaris
___

ronald.bear@eg*.af*.mi*

BRLC4FC> As cave divers we have all seen our bubbles just go
BRLC4FC> bubbling  out of the cave. Cave divers also realize
BRLC4FC> that  bubbles released more than a few hundred feet
BRLC4FC> into the cave most likely do not find their way out
BRLC4FC> the  entrance.  I'm  sure  that some of the bubbles
BRLC4FC> make  it  all the way to the surface through cracks
BRLC4FC> that  are  much too small for humans. I don't think
BRLC4FC> that  either  of  these  mechanisms is what you are
BRLC4FC> primarily asking about ...


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