But what truly sets Long Island apart is its claim to fame as the home of Dean's Blue Hole — one of the deepest blue holes in the world and the site of an annual freediving competition.

It's a beautiful sight whether viewed from the beach, the water, the cliffs or on a guided dive into its cobalt depths. Some daredevils also jump from the cliffs into the blue hole. Dean's Blue ...

Researchers think that other marine sinkholes, like Dragon Hole in South China Sea, and Dean's Blue Hole in the Bahamas probably formed the same way. As the scientists continued down the hole ...

Other famous examples of these types of blue holes are the Great Blue Hole in Belize, Dean's Blue Hole in the Bahamas ... "On ...