There`s a giant ‘Green Banana` off Florida`s coast, and researchers have finally gotten to the bottom of it
(Sun-Sentinel Miami Dolphins Blog)

About 60 miles west of Sarasota, in the Gulf of Mexico, is the “Green Banana” blue hole, explored to its deepest point for the first time in August 2020. Think of it as an hourglass-shaped sinkhole in the Atlantic Ocean that might have formed more than 10,000 years ago. And it could be a vitally important area.