Blue Hole in Sea and Oceans

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. Tags: unbelievable facts world facts animal facts hard fact animal facts human facts accidents world record dictionary sex facts fastest strongest longest dangerous horrible love and romance facts blue facts marine facts info blue holes no oxygen facts of blue hole in sea and ocean.