Narrator: There's a massive underwater sinkhole off the coast of Belize that extends ... descent to the bottom of the Blue Hole. Their mission was to create a 3D map of the sinkhole's interior ...

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.

And so, when Richard Branson and a team of scientists took a submersible down to the bottom of Belize’s iconic Giant Blue Hole ... was to create a 3D map of the hole’s interior but, when ...

A 30-meter sediment core from Belize's Great Blue Hole reveals 5,700 years of hurricane history, showing a sharp rise in ...