DEAN'S BLUE HOLE

The hole, 203 meters deep and 76 meters wide, was immortalized thanks to the splendid video of Guillaume Nery. Quadruple world record holder in constant weight apnea (descent and ascent with or without the force of the fins), he had fun doing Base Jumping, underwater, and produced a superb short film visible on the net. This blue hole was considered to be the deepest in the world until the discovery, in 2016, in the waters of the Paracel Islands in the South China Sea, of the Dragon's blue hole, which is 300.89 metres deep!