It's called the Great Blue Hole. Scuba divers and snorkelers have ... Every day, waterfalls of sand fall into it, slowly filling it up like an underwater hourglass. But as for now, we can still ...

Surrounded by cliffs on three sides that form a natural amphitheater, the blue hole is also fringed by a white sand beach and opens onto a shallow lagoon. It's a beautiful sight whether viewed ...