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Blue Hole

Source: TOI


About Blue Holes:

The blue hole is the second deepest marine sinkhole or cavern discovered in Chetumal Bay, off the coast of the Yucatan Peninsula in Mexico
Colour Dark blue, caused by the high transparency of water and bright white carbonate sand
Water Circulation Poor, commonly anoxic below a certain depth
Sea Life An unfavourable environment for most sea life can support large numbers of bacteria that live off sulfur compounds
What are Blue Holes They are large, undersea vertical caves or sinkholes found in coastal regions.
Karst formation Blue Holes are found on coastal karst platforms around the world. They are formed by the dissolution of soluble rocks such as limestone, dolomite, or gypsum
Deepest Blue Hole Dragon Hole (Longdong) in the South China Sea
Overall Largest Blue Hole Great Blue Hole, located 100 kilometres from the coast of Belize, is 300 meters wide and 125 meters deep