Blue hole
Videos
A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock. Blue holes typically contain tidally influenced wa
The Great Blue Hole, located near Lighthouse Reef, Belize
Dean's Blue Hole, Long Island, Bahamas
Watling's Blue Hole, San Salvador Island, Bahamas
Blue Hole (Red Sea)
Videos
The Blue Hole is a diving location on the southeast Sinai, a few kilometres north of Dahab, Egypt on the coast of the Gulf of Aqaba within the Red Sea.
Blue hole
…or mixed chemistry. They extend below sea level for most of their depth and may provide access to submerged cave passages. Well-known examples are the Blue Hole of Dahab in the Red Sea, Dragon Hole in the South China Sea and in the Caribbean: the Great Blue Hole and Dean's Blue Hole. Blue holes are distinguished from…
Blue Hole seen from above. The area towards the sea is not "The Arch" but a shallow bank called "The Saddle".
Memorial plaques for divers killed in the hole, left by families and friends at the site
Technical diver passing under the Arch.
Tarek Omar.