Great Blue Hole

The Great Blue Hole is a giant marine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 70 km (43 mi) from the mainland and Belize City. The hole is circular in shape, 318 m (1,043 ft) across and 124 m (407 ft) deep.[1] It was formed during several episodes of quaternary glaciation when sea levels were much lower. Analysis of stalactites found in the Great Blue Hole shows that formation took place 153,000; 66,000; 60,000; and 15,000 years ago. As the ocean began to rise again, the cave was flooded.[2] The Great Blue Hole 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).[3]

Exploration and name

This site was made famous by Jacques Cousteau, who declared it one of the top five scuba diving sites in the world. In 1971 he brought his ship, the Calypso, to the hole to chart its depths.[4] Investigations by this expedition confirmed the hole's origin as typical karst limestone formations, formed before rises in sea level in at least four stages, leaving ledges at depths of 21 m (69 ft), 49 m (161 ft), and 91 m (299 ft). Stalactites were retrieved from submerged caves, confirming their previous formation above sea level. Some of these stalactites were also off-vertical by 5˚[1] in a consistent orientation, indicating that there had also been some past geological shift and tilting of the underlying plateau, followed by a long period in the current plane. The tilt indicates that this was a movement of the land, rather than a rise in sea level alone.[4]

Initial measured depth of Great Blue Hole was 125 m (410 ft) which is the most often cited depth up to this day. An expedition by the Cambrian Foundation in 1997 measured the hole's depth as 124 m (407 ft)[1] at its deepest point. This difference in measurement can be explained by ongoing sedimentation or by imprecision in measurements. The expedition's goal was to collect core samples from the Blue Hole's floor and document the cave system.[5] To accomplish these tasks, all of the divers had to be certified in cave diving and mixed gases.[5]

In December 2018, two submarines descended into the Blue Hole, in an attempt to map its interior. Using sonar scanning, the team was nearly able to complete a 3-D map of the 1,000 foot wide hole.[6]


This is a popular spot among recreational scuba divers who are lured by the opportunity to dive in sometimes crystal-clear water and meet several species of fish, including midnight parrotfish, Caribbean reef shark, and other juvenile fish species. Other species of sharks, such as the bull shark and hammerheads, have been reported there, but are not regularly sighted. Usually, day trips to the Great Blue Hole are full-day trips from the coastal tourist communities in Belize.

On-shore caves of similar formation, as large collapsed sinkholes, are well known in Belize and in the Yucatán Peninsula, where they are known as cenotes. Unlike the mainland cenotes which often link to underwater cave systems, there is little evidence of horizontal development in the Blue Hole.

In 2012 Discovery Channel ranked the Great Blue Hole as number one on its list of "The 10 Most Amazing Places on Earth".[7] In 2018, they featured a two-hour special titled Discovery Live: Into the Blue Hole featuring Fabien Cousteau and Richard Branson.[8]

See also


  1. The Great Blue Hole of Lighthouse Reef Atoll, Belize, Central America: Deep Technical Diving to Collect Sea-Level Records. Transactions of the Fifteenth Caribbean Geological Conference.
  2. "Belize Blue Hole reef". NASA.
  3. "World Heritage Nomination – IUCN Summary Belize Barrier Reef Reserve System (Belize)" (PDF). IUCN/WCMC.
  4. Jacques-Yves Cousteau (1973). Galapagos – Titicaca – The Blue Holes (Hole). London: Cassell.
  5. Tysall, Terrance N (1999). "The Belize Blue Hole Exploration Project". In Hamilton, RW; Pence, DF; Kesling, DE (eds.). Assessment and Feasibility of Technical Diving Operations for Scientific Exploration. American Academy of Underwater Sciences. Retrieved 2011-01-08.
  6. Street, Francesca. "Dispatches from the bottom of Belize's Blue Hole". Retrieved 2019-02-18.
  7. Robert Lamb; Amanda Arnold (2012). "The 10 Most Amazing Places on Earth". Discovery Channel. Archived from the original on 2012-11-09. Retrieved 2013-09-12.
  8. "DISCOVERY LIVE: INTO THE BLUE HOLE". Retrieved December 3, 2018.

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