Why is there such a big hole in Belize? This underwater sinkhole is almost perfectly round. It shows us what the Earth was like long ago. It also shows how our planet is always changing.
Following is a transcript of the video. 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.
Nearly 27,000 years ago, a giant ground sloth traveled across a barren, arid landscape in what is now Belize, munching on grassy vegetation and searching for water. A nearby sinkhole may have ...