And oceanographers haven’t even found the bottom yet. Taam Ja’ Blue Hole took over the title of the world’s deepest blue hole — an underwater sinkhole — on April 29, a paper in Frontiers ...

This makes TJBH the deepest blue hole in the world, leaving behind the 301 meters (990 feet) deep Sansha Yonga Blue Hole of the South China Sea. However, the currently measured depth is not final ...