What It’s Really Like To Dive The Great Blue Hole

Posted on Saturday, May 17th, 2014

The Mysterious Belize Great Blue Hole is a large underwater hole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 100 kilometers (62 mi) from the mainland and Belize City. The hole is perfectly circular in shape, over 300 meters (1000 ft) across, 3140 feet circumference and 125 meters (410 ft) deep.

Read also: Dive the Great Blue Hole of Belize with this Vacation Package

It was formed as a limestone cave system during the last glacial period when the sea level was 400 to 500 feet below present time and was dry land. Last glacial period began about 120,000 years ago and end about 15,000 years ago. Reaching the maximum extension 26,500 years ago. At the end the ocean began to rise, the caves flooded, and the roof collapsed.

Believed to be the world’s largest feature of its kind, the Great Blue Hole is part of the larger Belize Barrier Reef Reserve System, a World Heritage site of the United Nations Educational, Scientific and Cultural Organization (UNESCO).

The hole itself is the opening to a system of caves and passageway that penetrate this undersea mountain. In various places, massive limestone stalactites hang down from what was once the ceiling of air-filled caves thousand of years before the end of the last Ice Age 15,000 years ago. When the ice melted the sea level rose, flooding the caves. This process occurred in stages. Evidence for this are the shelves and ledges, carved into the limestone by the sea, which run the complete interior circumference of the Blue Hole at various depths.

great_blue hole of belize

The Blue Hole is a “karst- eroded sinkhole.” It was once a cave at the center of an underground tunnel complex whose ceiling collapsed. Some of the tunnels are thought to be linked right through to the mainland, though this has never been conclusively proved. Notable are the large population of sharks such as lemon, black tip, reef, hammerhead, and bull sharks.
Mysterious and legends always have been around the Belize Blue Hole.

Read also: Scuba Dive the Great Belize Barrier Reef with this Vacation Package

This was the entrance to Xibalba?. It’s the kind of underwater geology that inspires speculation about aliens creating geometrically perfect anomalies, mermaids and monsters living in darkness.

I explored the bottom of the Blue Hole perimeter (3,140 feet circumference). To do this I dove down twice, reaching the depth of 375′ feet which took 4 to 5 hours of diving each day.
Video Music:
Start to 2:18 min. “Dawn From Four Sea Interludes” by Benjamin Britten
2:18 to 4:37 min. “300 Violin Orchestra” by Jorge Quintero
4:37 to End “Groove Armada” from Tomb Raider Soundtrack

Video and Blog courtesy of Ramon Llaneza

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