Few have dared to venture to the eerie depths of this gaping void. But a crew from Aquatica Submarines took the plunge, and what they found was unexpected.
The Great Blue Hole is the world's largest sinkhole, measuring a massive 300 meters (984 feet) across and roughly 125 meters (410 feet) deep.
The team of scientists, which included Fabien Cousteau, the grandson of iconic underwater explorer Jacques Cousteau embarked on their odyssey in December 2018, determined to discover the secrets of this oceanic oddity.
Many have explored the Blue Hole but it took two submarines to map the floor of the cavern, and what they found was somewhat unusual.
Researchers noted, that they found no signs of life or organic matter. The reason for this is a layer of hydrogen sulfide, which creates a barrier destroying oxygen beneath it.
Despite this discovery the Blue Hole continues to fascinate many for its unusual beauty and deadly secret.