Blue Holes

 
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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