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Another pitch the people at BMD used was that fully closed circuit 
rebreathers where very dangerous.  They claimed that with thier unit 
if you did not exceed the operational depth/time range of your mix 
there was no way to be fatally affected by hypercapnia ( CO2 poisoning ), 
hypoxia ( lack of O2 ) or Hyperoxia ( O2 poisoning ).  I can believe 
that thier unit is safer from this standpoint than the Prism, CIS-Lunar, or 
BioMarine Seapack 1000.  All of these units do have the potential for
the above problems.  People on this list and else where have
state that break downs are common ( especially in the Seapack 1000 ) in
fully closed circuit units.  BMD stated that many people have died using fully 
closed circuit units.  Does any one have any perspective on the safety and
reliability issue?


Barrie Kovish
Vancouver, Canada
bmk@ds*.bc*.ca*

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