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From CBTCC%CUNYVM.BITNET@mitvma.mit.edu

In article <C1H2D0.E3G@law7.DaytonOH.NCR.COM>, "Ephraim P. Hochberg"
<eph3@po.cwru.edu> says:
>
>Does anyone know how rebreathers work? All I know is that they act like
>SCUBA gear, but give off no bubbles. What kind of duration do they have?
>How expensive are they?
>
>                        Thanks,
>                                Ephraim Hochberg

Rebreathers (as the name implies) give off no bubbles because nothing is
expelled- you breathe the same air several (many?) times.  This is
accomplished by putting the air through a series of filters that scrub most/
all of the CO2 out of the mixture.  For a long time, the only use for
rebreathers was for short-range, covert missions; the filters were notoriously
inefficient.  Recently, though, my SCUBA instructor told me that he had
seen a rebreather rated at many, many hours.  This would presumably be used
mainly for very deep dives, where decompression stops are a must, or for
insertions onto shore, when the sub/ship/aircraft could not get
very close. Sorry I can't give more nuts/bolts, but I don't know 'em.  But
thinking about it, I wouldn't be surprised if activated charcoal was in there
someplace.  Isn't that what WW2 subs used to reduce CO2, when they had to
stay submerged for a long time?

Chris