Narrator: There's a massive underwater sinkhole off the coast of Belize that extends 125 meters into the Earth's crust. It's called the Great Blue Hole ... that this was a big, dry cave, and ...

The Great Blue Hole is a top attraction in Belize, drawing many tourists each year. They come for adventure and to see a natural wonder. Tourism is big in Belize, making up 40% of its economy ...

Now, its Stingray 500 submarine is about to embark on its first expedition—a high profile exploration of the famed Belize Blue Hole. Situated in the centre of the Lighthouse Reef, 65 kilometers ...