Great Blue Hole:

Is a Huge Submarine Sinkhole just off The Coast of Belize.

The sea life in this area comprises several types of reef sharks such as the Caribbean reef shark and the Blacktip shark and nurse sharks, giant groupers. A Dive trips to the Great Blue Hole is a full-day trip that typically consist of one dive in the Blue Hole.

Reference

10 Most Amazing Sinkholes In The World | 10 Most Today. (2015). Retrieved on February 8, 2015, from http://10mosttoday.com/10-most-amazing-sinkholes-in-the-world/.

 

Great Blue Hole Of Belize. (2015). Retrieved on February 8, 2015, from http://www.belize.com/belize-blue-hole.