Green Banana Hole, Underwater sinkhole in Gulf of Mexico, Florida, US.
The Green Banana Hole is an underwater sinkhole in the Gulf of Mexico off Florida's coast, with its opening located about 154 feet (47 meters) below the surface. The cavity descends deeper into the seafloor, creating an hourglass-shaped formation beneath the water.
The sinkhole formed roughly 8,000 to 12,000 years ago when sea levels were lower and Florida's shoreline extended much further out. At that time, different water levels and natural processes carved out this underground cavity in the seafloor.
The sinkhole draws marine researchers who visit regularly to study its ecosystem and water composition. This ongoing work shows how scientists use modern equipment to explore and understand life in these deep underwater zones.
Reaching this site requires specialized diving equipment and underwater instruments since the depth and conditions limit access to experienced divers. Visits are typically organized as part of research teams rather than open to leisure diving.
The name comes from a fishing boat captain in the 1970s who spotted an unripe banana peel floating above the hole. This chance discovery led to the finding and naming of this geological feature.
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