What caused the Great Blue Hole?
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Due to cave flooding
Blue holes are called sinkholes in the seas. The water inside such funnels looks darker than in the adjacent water area. During the ice age, when the ocean level was about a hundred meters lower than the current one, limestone cave systems were formed in some parts of the land due to erosion. When the level rose, many caves were flooded, their vaults collapsed.
A large blue hole off the coast of Belize is the largest only in diameter (318 m). The depth of this funnel is only 124 m. The record for depth belongs to the Dragon Hole in the South China Sea (301 m).
