The Great Blue Hole is a large underwater sinkhole, the result of a cave that collapsed centuries ago off the coast of Belize. It is a feature attraction of diving in Belize, especially for divers with an 
appreciation of geographical phenomena. It is a part of the larger Belize Barrier Reef Reserve System, a World Heritage Site of the United Nations Educational, Scientific and Cultural Organization (UNESCO). This site was made famous in 1972 by Jacques-Yves Cousteau declared it one of the top ten scuba diving sites in the world.
It lies near the center of Lighthouse Reef Atoll, a small atoll 70 kilometers (43 miles) east from the mainland and Belize City and is managed by the Belize Audubon Society.
This large limestone sinkhole is a stunning jewel, set in a ring of corals, almost perfectly circular in shape, measuring over 300 meters (984 feet) across and 124 meters (407 feet) deep. This ocean-floor sinkhole is believed to be the world’s largest natural blue hole formation of its kind. It is one of the most astounding dive sites to be found.
It was formed during several episodes of Quaternary glaciation when sea levels were much lower - the analysis of stalactites found in Great Blue Hole shows that formation has taken place 153,000; 66,000; 60,000; and 15,000 years ago. As the ocean began to rise again, the caves were flooded.
It’s mammoth-size cave, once dry as evidenced by stalactites, has been submerged here since the Ice Age. At 100 feet, the wall gives way to a deep undercut. At a depth of 130 feet, the dimly lit cavern’s great upside-down monoliths hang from the ceiling, extending over 25 feet. It is quite a sight to see the stalactites silhouetted against the blue glow of filtered light coming from beyond the ledge. Divers descend into the tranquil abyss to see geological wonders and fascinating marine life. Giant stalactites, dripstone sheets, and columns are located in the Gallery at the southern rim of the Great Blue Hole. These structures formed in a dry cavern above sea level during glacial periods.
Its coral rim is home and foraging ground to multiple marine species. Notable are the large population
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