What's Inside the Great Blue Hole?

It looks pretty and mysterious, a natural wonder on its own, perhaps the only one of its kind. The Great Blue Hole off the coast of Belize is exactly what the name says, it's a circular sinkhole with a deep blue hue which is oddly different from the surrounding waters. It's surrounded by an atoll in the Caribbean Sea. What lies in the waters of the Great Blue Hole was a mystery to most but a recent expedition featuring Richard Branson has been launched in order to explore the waters underneath it.

(Image credit: Wikimedia Commons)