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Can not identify the gas, don't breath it. Even if you hung it on a
float line, if you can not see it or your depth guage, you best not
breath it.

Your back gas answer is the best one, that is why I threw in the deco
weenie comment. The farm animals tell you that you can not deco on back
gas. I do it all the time.

For searches like that one, I would do a series of short bt's. 

Randy Bohrer wrote:
> 
> KVI wrote:
> 
> "Don't bother telling me that there are situations where you can
> notsee the
> bottles and need to have some convoluted scheme for identifyingthem,
> unless you
> will, in front of me, take two differernt handguns, onethat is loaded
> and one
> that is not, and go into the closet and pull thetrigger to your head
> on the
> unloaded one by "feel", "color", "poodlejacket" or
> other farm animal stupid method of identification."
> 
> That'll probably work. But try this: Take two handguns, one loaded and
> one unloaded. Tell your non-gun owner helper that you feel seasick and
> would like for him to place a rubber band on the loaded gun for you.
> Then ask him to place the loaded one (was that with or without a
> rubber band?) in your right holster (is that while facing you, or your
> right?), and the unloaded one in the left holster. You and your helper
> need to also help your four students do the same thing. Now run around
> for 30 minutes, having fun, but in a stressful enviroment. At the 30
> minute mark, everyone draws their unloaded handgun, puts it in their
> mouth and pulls the trigger.
> 
> I love this stuff!
> 
> But, on the other hand, I'm diving a quarry doing a body recovery
> (non-diver). Conditions are 5 foot vis surface to bottom. My job is to
> do a search at the deepest point (about 190 ft), where I will generate
> about 50 minutes of deco. The other divers will search in the 50-100
> foot range. I didn't realize that the shallow search divers where mud
> puppies, so I didn't object when the coordinator put them in the water
> at the same time as me. When I reach my first deco stop at 70 feet, I
> find that the visibility is zero (can't read gauges, etc.). What do I
> do? Is the safest approach to ascend breathing back gas, estimating
> depths and stop times until either I get enough vis to make a positive
> visual ID on the bottle(s) or I'm sure that I'm shallower than the MOD
> for my hottest mix? (This hasn't happened to me, but it happened to
> someone I know). I know it's a very rare case, but what do you think?
> 
> I hate this stuff!
> 
> By the way, I think the way to do this dive, given these exact
> conditions, is to plan deco so only one deco gas is used. But, if we
> change the conditions a little, and make it a 250 foot deep dive, then
> we might need two deco gases. This one's got be stumped worse than my
> last booster pump rebuild (Is their an on-going bet in the dive
> community that someone can send me a booster that I can't rebuild? You
> guys are driving me crazy sending me boosters with missing parts,
> extra parts, wrong parts, etc!)
> 
> See Ya,
> Randy
>

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