Blue hole refers to a blue cave, with two types: oceanic blue holes and terrestrial blue holes. An oceanic blue hole is a type of sinkhole that exists on the seabed, also known as underwater caves; many places in the world such as Belize, the Bahamas, and the Red Sea region have blue holes. Due to the lack of water circulation, marine life cannot survive in blue holes, but they hold scientific research value. Currently, scientists have discovered many ancient fossils and some animal remains at the bottom of blue holes.

Dean’s Blue Hole is located in a bay in Clarence Town, Long Island, Bahamas, believed to be the deepest oceanic blue hole in the world. In 1992, Jim King completed the entire journey of this blue hole for the first time; in April 2010, the renowned diver William Trubridge broke the world record for free diving by reaching a depth of 92 meters in this blue hole; in the same year in December, he swam to a depth of 101 meters using only his hands and feet for propulsion.

Dean’s Blue Hole
Reason to visit: The deepest oceanic blue hole in the world
Continent: North America
Country/Region: Bahamas
Province/State: Long Island
City: Clarence Town