I was going thru some BioMarine rebreather info when I came upon a section on how to use the rebreather as a semi-closed unit. If the electronics malfunction or you use up all your O2, you can switch off the O2 infeed and breathe the diluent while exhaling thru the nose on every fifth breath. Anyone else heard of this? I also noticed a picture of a BioMarine unit with an extra hose for buddy breathing. Mark Pansing NSS 26348 markp@co*.co*
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