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Keith, 
I'm afraid that a Trimix filled balloon must be pretty big, to be able
to keep the weight of the line and it's shell ( bit sturdier than a
child ballon probably, and the adherent water airborne.

In fact the german Navy asked Draeger for such a device, they made ist
for them , on pure Helium, but its use/ storage was discontinued because
of the cost of maintenance. I believed the contracts said something like
750,- DM for annually maintainance, which included exchange of the
He-cartridge.
Matthias

Keith Taylor schrieb:
> 
> Matthias,
> 
> Question, if you're diving trimix, which will be lighter than air, could you
> fill a balloon with mix, send it aloft, and attach it to a reel as a signal
> device?
> 
> Keith
> 
> "99 red balloons floating in the summer sky" - Nina
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