description Great Blue Hole Overview
The Great Blue Hole is a dramatic marine sinkhole located off the coast of Belize. Formed within a collapsed limestone cave system, it’s one of the world's most notable underwater geological features. Its significant depth – reaching over 125 meters – attracts experienced scuba divers and researchers studying ancient sea levels and unique ecosystems. The site offers insights into karst topography and its formation processes.
help Great Blue Hole FAQ
Where is the Great Blue Hole located?
The Great Blue Hole is located in the Lighthouse Reef Atoll, approximately 70 kilometers off the coast of Belize. It sits in the center of the Lighthouse Reef and is easily visible from space.
How deep is the Great Blue Hole?
The underwater sinkhole reaches a maximum depth of over 125 meters (410 feet). Because of its extreme depth and dark conditions, it primarily attracts highly experienced technical scuba divers.
How did the Great Blue Hole originally form?
The sinkhole originally formed as a limestone cave system during the Pleistocene epoch when sea levels were significantly lower. The cave's ceiling eventually collapsed as ocean levels rose at the end of the last ice age, flooding the cavern.
What famous oceanographer explored the bottom of the Great Blue Hole?
Jacques Cousteau famously brought his ship, the Calypso, to the Great Blue Hole in 1971 to chart its depths. More recently, a high-profile expedition led by Fabien Cousteau and Richard Branson explored the bottom in 2018.
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