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What are all these references to Hydrogen sulfides? Did I miss something?

I've been wondering about them, because we've been diving a quarry lately,
with sometimes 70" viz and extensive underwater tunnels, and noticed that
at the very bottom in the deepest spots the viz drops abruptly off to about
2' like there is a pool of ink on the very bottom. Recall a guy who works
with some org doing fresh water surveys telling me about the dangers of
some sort of sulfer in sick water - told me that it was deadly, and that if
I was ever diving at bottom and viz suddenly turned black to get the hell
out fast.


Did search on cavers & Techdiver archives. Some discussion, but no
agreement on how dangerous that stuff is (or if there are degrees of
danger, how one differentiates. Some said it's deadly, get out of the stuff
at once, you won't smell or taste it until it's too late, others said "no
problem, I dive it all the time".

Asked the owner of a nearby dive shop and he said, "Oh that's the sulfer
level" but knew nothing more, had never heard it was dangerous and said he
never heard of anyone making a point of avoiding it.

Also possible it wasn't hydrogen xxsufite at all - pretty sure it wasn't
just a thermocline, but one sometimes run into a tannin layer around here.

I'm mostly a salt water/wreck type - can anyone tell me anything more about
this?


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