Science is Fun Fridays!
Dean's Blue Hole in the Bahamas is the world's deepest blue hole, (approx 663 feet).
This part of the ocean floor is largely limestone, and these sinkholes formed during past ice ages when the sea level was much, much lower. Deeper groundwater gradually dissolved the limestone until the ceiling of these voids collapsed. Over time it filled with water.
If we were to view it without water, it is shaped like a vase - large mouth, which narrows as you go down, before it opens into a large cavern underneath at about 66 feet.
William Trubridge holds the free dive record, reaching a depth of 302 feet without the use of fins.
The Vertical Blue Free Diving Championship is held here
The Bahamas Islands are along the edge of the Bermuda Triangle.
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