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- From: CBTCC%CUNYVM.BITNET@mitvma.mit.edu
- Newsgroups: sci.military
- Subject: Re: Seal Team Rebreathers
- Message-ID: <C1IsGw.81u@law7.DaytonOH.NCR.COM>
- Date: 27 Jan 93 16:00:32 GMT
- References: <C1H2D0.E3G@law7.DaytonOH.NCR.COM>
- Sender: military@law7.DaytonOH.NCR.COM (Sci.Military Login)
- Organization: City University of New York/ University Computer Center
- Lines: 28
- Approved: military@law7.daytonoh.ncr.com
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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
-