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  At the dive show at Olympia near Earl's Court in London 18-19 March 1995,
Cis-Lunar had a stand. In talk that arose about the maximum practical duration
of a rebreather (whether for one long dive or several short dives), he said
that a fairly small cylinder could contain enough oxygen for even 15 hours
diving; the limiting factor of the size of the absorbent canister; he showed a
picture of a 24-hour-duration rebreather used for cave penetration, it had
what looked like 2 canisters each as big as an aqualung cylinder.
  This reminded me of when last year someone posted on techdiver about a
rebreather which contains liquid oxygen, and the (oxygen coming out of the
oxygen tank to be used) is used to chill the diver's breath until the carbon
dioxide in it comes out in a box which gradually fills with solid CO2 snow
like freezer frost which is emptied out after the dive. No absorbent needed.
Thus no need to dispose of used absorbent as rubbish. Is such a device being
developed? Any news of it? But likely such a set would have to be refilled not
long before use; it couldn't be stored full for weeks or months waiting for
its user's next chance to dive.

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