See also NatGeo this month on the "blue holes of the Bahamas": http://ngm.nationalgeographic.com/2010/08/bahamas-caves/skiles-photography
At a certain depth, these holes have a layer of roughly 6 feet high where the water contains poisonous Hydrogen Sulfide (H2S).
On the other hand, studies suggest that H2S in low concentrations may
have therapeutic properties:
http://www.wired.com/epicenter/2010/02/mark-roth-on-mice-and-men/
Now, how do we fit this into Glorantha?
Cheers,
Henk
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