The most famous "black hole" in the Bahamas is Dean's Blue Hole, located on Long Island, which reaches a staggering depth of 202 meters (663 feet). For many years, it was considered the deepest saltwater blue hole in the world until the discovery of the Dragon Hole in the South China Sea and the Taam Ja' Blue Hole in Mexico. Dean's Blue Hole is unique because it is enclosed on three sides by a natural rock amphitheater and opens into a massive underwater cavern that is significantly wider than the surface opening. Because of its incredible depth and lack of strong currents, it is the premier global destination for freediving competitions, such as the annual "Vertical Blue" event, where elite athletes dive to over 100 meters on a single breath. The water is exceptionally clear, and the transition from the turquoise shallow lagoon to the dark, bottomless blue of the hole is one of the most striking natural sights in the Caribbean.