Located roughly 40 miles off the Belize coast, the Blue Hole is thought to have once been a giant cave on dry land, thousands of years ago. As the ocean rose again, the cave flooded.

A mission to the bottom of Belize's Great Blue hole has generated the first-ever high-resolution map of what's inside and that includes stalactites, a conch graveyard and a layer of toxic chemicals.

From 19-23 January 2015, UNESCO's World Heritage Centre, in cooperation with the International Union for the Conservation of Nature (IUCN), undertook a technical support mission to Belize with the ...

A new expedition is set to map the bowels of a mysterious blue sinkhole off the coast of Belize, ... a UNESCO World Heritage site, is 1,043 feet (318 meters) in diameter and 407 feet (124 m) deep.

Located roughly 40 miles off the Belize coast, the Blue Hole is thought to have once been a giant cave on dry land, thousands of years ago. As the ocean rose again, the cave flooded.