Scientists to explore underwater 'blue holes'

[Still Waters]

Blue holes are underwater sinkholes, similar to sink holes on land. Underwater sink holes, springs, and caverns are karst (calcium carbonate rock) features that are scattered across Florida’s Gulf continental shelf. They vary in size, shape and depth, but most are ecological hot spots with a high diversity of abundance of plants and animals.

https://oceanexplorer.noaa.gov/explorations/20blue-holes/welcome.html

[Eldorado]

"Researchers are flocking to a 425-foot-deep "blue hole" off Florida's Gulf Coast next month in search of signs of life, among other things.

"The hole has been dubbed Green Banana.

"Green Banana is located about 155 feet below the water's surface, according to the National Oceanic and Atmospheric Administration (NOAA).

"It was first discovered not by researchers or scientists, but by fishermen and recreational divers, and is similar to sinkholes found on land."

Full monty at CBS:https://www.cbsnews.com/news/blue-hole-florida-coast-search-signs-of-life/

Florida's Blue Holes; Oases in the Sea (30mins docu): https://www.youtube.com/watch?v=WHatkfXNIuw&feature=emb_logo

Edited July 24, 2020 by Eldorado

[Doug1029]

1 hour ago, seanjo said:

My understanding is that Florida's ground is made up of porous volcanic material, like pumice. That is why there are so many spurious sink holes. 

It's mostly limestone.  The holes are solution cavities.

Doug