Belize's Great Blue Hole is one of Earth's most mysterious ... miles offshore from Belize City and is part of the Belize Barrier Reef, a UNESCO World Heritage Site. 4. The underwater caves of ...

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 ... usual suspects: reef sharks, turtles ...

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.

Belize's Great Blue Hole is one of Earth's most mysterious ... miles offshore from Belize City and is part of the Belize Barrier Reef, a UNESCO World Heritage Site. 4. The underwater caves of ...