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Marc, 
 
What you saw on the BioMarine unit was the MANUAL addition valves, of which
there are two - one on the right (with the unit on your back), which you
activate with your hand to manually add oxygen, and one on the left for
diluent. 
 
Inside the machine - there is only one other way for oxygen to enter the
counterlung, and that is through the solenoid. 
 
On the diluent side, there is one way for the machine to add diluent (which
it does passively), and that is the Schrader valve in the center section
which is activated by a collapsing counterlung.  I don't know how the other
guys units behave, but I can breathe my counterlung all the way down, then
take a giant breath of air, and the Schrader valve adds diluent as fast as
I can inhale. 
 
This design is so simple, and so smart, it makes you wonder why anyone
would try to design anything else, especially putting batteries in the
breathing loop, which sounds kinda dumb (but I'm not an electrician, nor a
battery engineer, so I'm not really qualified to say for sure that it is
totally stupid). 
 
I don't know about the Cis Lunar, but from Pyle's description, sounds like
lots of small objects can randomly fall on it, and jam its function.  I'll
betcha even a horny cleaning wrasse could gum up the works.  
 
 If its not that, maybe the expiration date on the Cis Lunar internal
computer (which, I understand, is connected via satellite to the
headquarters of Jiffy Lube) comes up, and the explosive bolts that attaches
the unit to the backpack go off leaving Rich alone with that damn wrasse
still trying to clean his mustache 
 
But Rich is safe from me dropping parts of an underwater housing on his rig
- I'm not the cameraman, John is, and he doesn't drop shit. 
 
Since I'm the writer part of that team, Rich might have to worry about me
dropping a PowerMac on it, but then again, he's probably an IBM'er
anyway... 
 
Later. 
 
Kevin 
HeyyDude. 
 

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