Explore the depths of the Great Blue Hole—one of the most breathtaking, mysterious, and dangerous dive sites on Earth. Sharks ...

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 ...

A 30m-long sediment core from the Great Blue Hole, a marine sinkhole offshore Belize ... a UNESCO World Heritage Site. 4. The underwater caves of the Blue Hole are filled with giant stalactites ...