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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