There are many amazing things in the world - unknown and still only being studied. They are called by analogy with blacks, only they are not in space, but in water.
They can be found in the sea or in the ocean, differ in considerable depth, even if they are in shallow water, and really stand out in rich blue or blue.
The structure and origin of blue holes
As a rule, they are a cave, and more often a whole network of underwater caves, and therefore immersion in such objects is very interesting for divers. People actively visit these caves in the Bahamas and in many other places in the world. They are in Egypt, Belize, and Malta.
A kind of tunnels, underwater wells, which you can enter only when immersed in water. Karst caves that formed initially on the surface of the earth - this is the origin of most blue holes. In the future, one way or another, these systems of karst caves turned out to be under water - due to rising water levels, lowering the terrain, and so on. These are quite normal geological processes, due to which not only caves but also entire coastal cities find themselves under water.
Features of Blue Holes
Such objects are densely populated by underwater inhabitants, and are an excellent environment for their habitation. Their depth can be different - so, the deepest of them is in the Bahamas, it has its own name - Dina. The depth of the object is 663 meters, and divers often dive here. The length of such caves can be hundreds of meters.
The average diameter of the object is less than a hundred meters, but there are also larger holes. So, the Big Blue Hole near the Belize Reef has a diameter of three hundred meters, but its depth is not so great - only 124 meters. And it is also a place of pilgrimage for divers from all over the world.
All blue holes have a round funnel shape, which emphasizes their karst origin. For the most part, their origin dates back to the last ice age, to its end, when karst ravines formed during the melting of glaciers, and due to the ingress of large amounts of water into the oceans, its level rose rapidly. And over time, these objects flooded the waters, creating another unique natural wonder.
Blue holes were actively studied by underwater explorer Jacques Cousteau, it was he who noted them as great places for diving, identifying them in the top ten in terms of attractiveness. He investigated Belizean underwater objects, plunged into them, confirmed the theory of their origin in the ice age.
He also discovered stalactites and stalagmites, columnar formations that form in caves when water drips and minerals are deposited. Since they were at a slight slope, the scientist was able to prove the fact that a geological shift occurred on the local plateau, and this happened in relatively recent time.
Danger of blue holes
Belizean holes pose a danger to divers and those who are on the water at high tide. The rushing waters create a powerful whirlpool, which pulls in any objects, up to small boats. At this moment, for people nearby on the water or in water, a significant danger is created, and there have already been deaths. When the ebb tide occurs, it is also restless - a hole throws out garbage and water, creating powerful fountains.
Despite the danger, as well as the remoteness of this place, which is located almost 100 km from Belize, tourists rush here constantly, and this place is well-known among divers. Moreover, the place is interesting not only as a natural object, but also as a territory on which interesting aquatic inhabitants live. Large fish like to settle in blue holes, and as for Belizeans, sharks of many species live here, mostly not dangerous for humans, and giant groupers, and also many other interesting objects for observation.
Diving into a blue hole is not always a safe, but in any case a very interesting adventure. And people who are fond of diving are ready to go though half the world to see this miracle with their own eyes and make an exciting dive.
