Great Blue Hole
From the air it looks like the planet's eye — a perfectly circular hole of deep blue amid a turquoise reef. The Great Blue Hole off the coast of Belize is one of the world's most famous dive sites, a place Jacques Cousteau included in his top ten for diving. When you descend into this abyss, you understand why: it's an entrance to another world, a geological time machine.
What Is the Blue Hole
The Great Blue Hole is a karst sinkhole, a flooded cave that formed more than 150,000 years ago when sea levels were significantly lower. Back then it was an ordinary limestone cave on dry land. When t...