Here’s what you need to know about natural wonder, which despite being a popular tourist destination, still hides many mysteries.
Where is the Great Blue Hole sinkhole?
The Great Blue Hole is a large underwater sinkhole off the coast of Belize.
It lies near the centre of Lighthouse Reef, a small atoll 62 miles from the mainland of Belize City and is part of the larger Barrier Reef Reserve System, a UNESCO heritage site.
The Blue Hole is thought to have once been a huge cave on dry land around 100,000 years ago but as the ocean rose again, the cave flooded.
The formations were created during past ice ages, when the sea level was as much as 330-660ft lower than it is now.
Stalactites were retrieved from submerged caves, which confirmed limestone formations previously existed above sea level.
The Great Blue Hole was given its name by British diver Ned Middleton.
How deep is it?
The circular shaped hole is 410ft deep and 984ft across, making it the second largest of its kind after the Dragon Hole in the South China Sea.
The hole was first brought to the attention of the wider world in 1971 by underwater explorer Jacques Cousteau.
His grandson, Fabien has now teamed up with Branson and a team of scientists, explorers and filmmakers from the Aquatica Foundation.
The Blue Hole Belize 2018 Expedition was broadcast live on the Discovery Channel on Sunday December 2, 2018.
The expedition vessels will continue to monitor and explore the site for two weeks, collecting data that will allow experts to construct models of the Blue Hole's geography.
Can you go diving in it?
Jacques Cousteau declared the Great Blue Hole to be one of the top ten best diving spots on the planet.
The crystal-clear waters mean the Great Blue Hole is popular spot among divers, who can encounter several species of fish, including Midnight Parrotfish and Caribbean reef shark.
Other species of sharks, such as the bull shark and hammerheads have been reported there, but are not regularly sighted.
Day trips to the Great Blue Hole are run from the coastal tourist communities in Belize.
According to the Belize Travel Blog, divers enter a steeply walled entrance which goes down to about 110 feet where the first stalactite formations can be seen.
From there, they can explore overhangs or negotiate around gigantic stalagmites while still enjoying good visibility down to around 200 feet.
Experienced divers can make their way down to around 270 feet to explore underwater dunes and bedrock ledges.
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