After descending 20 meters, the hole widens considerably into a cavern with a diameter of 100 meters.
The intense blue color is created by high transparency of water and bright white carbonate sand.
These holes were formed by deeper groundwater gradually dissolving the limestone until the ceiling of these voids collapsed.
Later the sea level rose and filled the holes with water.
Dean’s Blue Hole is a popular spot for diving ad snorkeling.
