Mysterious blue hole in Bahamas

Bahamas Island – a tropical island surrounded by white sand, clear blue water and colorful coral reefs. Not only that, this place also hides a secret of “blue holes” under the sea that are as beautiful as caves with the blue color of the ocean.

Blue holes are underwater sinkholes, also known as steep-sided caverns. There are many different types of blue holes around the world, from Belize and the Bahamas to the Red Sea.

The name blue hole refers to the dramatic contrast between the darkest and lightest blues, caused by changes in water depth. Blue holes formed during the Ice Age, when sea level was 100–120 m lower than it is now. The deepest blue hole in the world is Dean's Blue Hole, 220 m deep, west of Clarence Town on Long Island, Bahamas. Other blue holes are about half as deep as Dean's, ranging from 100 to 120 m. Some of the holes have created entire underground cave systems.

From the water surface, they look like mysterious blue holes but also full of danger under the sea. At the first 100 meters, the water in the hole is very calm because it is not affected by waves, so it is very suitable for beginners to dive. However, in the deep hole, the circulation of water currents is not regular, so this area lacks oxygen, even at the bottom of the hole there is almost no oxygen, so it is very dangerous if you do not have extensive experience. Also because of the low light and oxygen conditions, this place has formed a very diverse and strange marine life population.

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