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  (1) Which rebreather absorbents can be regenerated by heating? How much do
they cost? Could this heating be done over a wood fire under remote expedition
conditions? How many regenerations are they usable for?
  (2) Cost of rebreather diving: if an oxygen rebreather's absorbent canister
can be refilled by its owner, how much will it cost for oxygen and absorbent
in $ per hour diving, compared with an air aqualung?
  (3) Carmellan (who made the SMS2000 automatic mixture rebreather in England)
spoke of military rebreathers with a 24-hour duration. How heavy and bulky
would (a) an automatic mixture rebreather, (b) an oxygen rebreather, have to
be for that duration? I don't want to stay underwater for 24 hours at a
stretch; but it would be useful for several short dives without having to
carry many spare aqualung cylinders about or to have to fiddle about in diving
site conditions or on a small boat changing cylinders and absorbent canisters.

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