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> This leads me to ask a question of the rebreather users out there: what do we 
> sound like on scuba?

A freight train.

> If the problem is the exhaust roar, a diffuser would fix it. If the problem
is 
> all the Darth Vader click and hiss on the inhale, then we're out of luck, but 
> even C2 must make that much noise.

It's actually the Darth Vader noise that travels the farthest (I can 
always hear a scuba diver approaching first by the hiss on inhale).  
However, the bubbles are more distracting to fish at close range.  I'm 
not sure how much is audio and how much is visual, but fish are always 
startled when I exhale through the nose on the breather, yet they seem 
oblivious to the click of the solenoid, or when I manually inject gas 
into the loop, or when I take an inhale hit off the OC regulator.

> Perhaps I was narced, or more likely just cold, but my final solution
(brought 
> to you by the same idiot who thought of the tail-biting kangaroo rat inside
the 
> mask as a deco computer HUD) was to route my warm exhaled gas into my
drysuit, 
> with a hair-trigger metered (and diffused) exhaust to keep the suit inflation 
> level right. This would lead to huge condensation in the suit, unless you
used 
> the reg-to-suit line to slightly chill the air and condense moisture into a 
> trap.

I think you'd be dealing with too much back-pressure on exhale.  If the 
dump was "hair trigger" enough to reduce the backpressure, then your dry 
suit would likely become a wet suit pretty quick.  Having never worn a 
drysuit, however, I wouldn't know.

Aloha,
Rich

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