Great Blue Hole

Great Blue Hole is a very large 410 feet deep submarine sinkhole situated at Belize in northeastern coast of central America. It lies approximately 60 miles off the main land of Belize.

Great Blue Hole

The hole is approximately circular in shape with 300 meter across and 412 feet deep. This hole is an astonishing site for divers all around the world. Also it is one of the America's famous tourist spots. The United Nations declare this site as one of the world's famous heritage sites. The "Discovery Channel" in 2012   include this sites among the one of the 10 most amazing places on earth.

Formation
Scientific research on great blue hole shows that the formation of the hole takes a long period of  153000, 66000, 60000 and 15000 thousand years ago. The hole was gradually created due to the phenomena of quaternary glaciation as the sea level were much lower. When the sea level rises, the caves were filled with sea water.
The species found in the holes were reef shark, Caribbean reef shark, giant groupers etc.