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The hole is the opening to what was a dry cave system during the Ice Age. When the ice melted and the sea level rose, the caves were flooded, creating what is now a magnet for intrepid divers. Today the Blue Hole is famed for its sponges, barracuda, corals, angelfish—and a school of sharks often seen patrolling the hole’s edge.
Blue Holes in Espiritu Santo Island, Vanuatu - Located just west of Fiji, on the Espiritu Santo island of Vanuatu you'll find some of the most crystal clear blue waters you've ever laid eyes on. Called blue holes, they're large, deep pools of clear, fresh water that come to the surface through layers of limestone and coral.