Blue holes are giant and sudden drops in underwater elevation
that get their name from the dark and foreboding blue tone they
exhibit when viewed from above in relationship to surrounding waters.
They can be hundreds of feet deep and while divers are able to explore
some of them they are largely devoid of oxygen that would support sea
life due to poor water circulation - leaving them eerily empty. Some
blue holes, however, contain ancient fossil remains that have been
discovered, preserved in their depths.
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