The Great Blue Hole, located off the coast of Belize, has long fascinated scientists ... Read also: Turtle sets deep-sea record with 4,408-foot dive in Solomon Islands Inside heist at Tenerife ...

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. Scuba divers and snorkelers have been ...

The Great Blue Hole, located off the coast of Belize, has long been a subject of interest for scientists. When divers finally reached its bottom, they discovered something quite shocking.

Declared a UNESCO World Heritage Site in 1996 – along with six other areas surrounding Belize's barrier reef – the Great Blue Hole remains one of the world's most distinguished scuba sites.