A blue hole is a dark blue hole in the ocean and is formed by debris on the bottom of the ocean. This hole was formed from the collapse of carbonate rock due to erosion that occurred thousands of years ago. As a result of these ruins, then the ocean is in the shape of a circle with a scary dark blue water. Typically, these dark blue holes form in low-lying coastal areas.
There is a solution of limestone such as limestone, gypsum and dolomite, due to the flow of rainwater which then results in the formation of vertical holes such as caves. When the sea water rises due to a solution of glaciers, and part of this hole is submerged in water so that it looks like a giant dark blue hole which is sometimes scary. Then the sunlight shining down strongly on it will give off an amazing color.
As a result, the shallow sea will appear blue and these deeper holes will be dark blue. It will look very beautiful from a distant view from above. See more: The Largest Old Car Wreck in the World
5 Awesome and Beautiful Blue Holes
1. The Great Blue Hole of Belize
This is one of the most famous blue holes and it is located off the coast of Belize. This is a small country in a part of central America. This hole is located in the town of Lighthouse Reef, as far as 70 km from 70 km from the mainland and Belize City. The Great Blue Hole has a very large size, measuring more than 300 meters with a depth of 124 meters. This blue hole was formed during the glaciation episode or around 150,000 to 15,000 years ago. This blue hole is a popular spot for death-defying divers.
2. Dean’s Blue Hole
Besides the Great Blue Hole of Belize there is another great blue hole, this is Dean’s blue hole. This blue hole is located close to Clarence Town on Long Island, Bahamas. Deans blue hole is the blue hole with the deepest depth. The habit of blue holes is only about 110 meters deep, but Deans is very deep, with a depth of more than 200 meters.
On the surface, a rough circle was formed. The circle can reach 25 to 35 meters. After descending about 20 meters, this blue hole has a cave formed with a circle of 100 meters.
3. Blue Hole of Dahab
The Blue Hole of Dahab is a dark blue hole that forms on the coast of the Red Sea, or a few kilometers from Dahab, Egypt. It is a blue hole with the second deepest depth in the world after Dean’s blue hole. The depth of the Blue Hole of Dahab is about 130 meters.
This blue hole is a dangerous blue hole because it has claimed the lives of many divers. The divers are trying to find a tunnel between the coral reefs which is called “The Arch”. Terowongona is said to connect the blue hole with open water at a depth of 52 meters.
4. The Blue Hole of Gozo
It is called Gozo because this blue hole is located on the west coast of the island of Gozo, Malta, Mediterranean. This is a blue hole 15 meters deep and only 10 meters wide in the rock bedrock. Under water, this blue hole is connected to the open ocean via a tunnel.
5. Watling’s Blue Hole
The next very impressive blue hole is Watling’s Blue Hole. This blue hole is located on Bahamian Island, Salvador. This is a blue hole that occurs on land unlike some of the blue holes that occur in the ocean. Indeed, this blue hole occurs in the middle of the island, but the water is not as fresh as on ordinary land. This shows that this blue hole has something to do with the ocean. It could be, the existence of this Watling blue hole is connected through an underground tunnel to the sea.