>  Come on , Richie - you and I both know what the real problems are, and they 
> don't go away until the laws of physics change, and in the last 48 years they 
> have not. 

Physics applies to SCUBA also.  People die on SCUBA also.  The 
fundamental difference is that rebreathers will always require more 
discipline because of 1) the maintenance of a breathing loop and larger 
number of expendibles; and 2) the insidious nature of the primary failure 
modes.  The question is, given 50 years of practice (or even 10 years) by 
the recreational community, what will be the death rate?  It's easy to 
say it will be large, but I don't think so. It will soon be very evident 
that these things do require more training, and therefore people will get 
more training.  I strongly believe that the reason we see training 
standards for SCUBA so slim these days is the reasonably good overall 
safety record.  The training standards evolve to conform to the accident 
rate.  Rebreathers won't tolerate slim training standards, so the 
training standards will be maintained higher.  

> You know a lot about rebreathers, so tell us why the commercial ones 
> work and the others don't. 

Which are the "commercial" ones?

Rich

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