The world's biggest ocean sinkhole is a popular attraction for divers, but at over 400 feet deep, the bottom has remained a mystery. During their trip, the team conducted over 20 dives with the aim of creating a 3D sonar map.
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But at the bottom of the Great Blue Hole was the most shocking discovery of all — human rubbish. Branson's team found a two-litre Coke bottle that had made its way 124 metres deep, as well as a lost GoPro camera full of someone's holiday photos.
Blue holes, physically, are hazardous due to their structure and depth. Their surrounding walls cause bad water circulation, meaning the water is generally depleted of oxygen.
Biodiversity is one of the most important reasons why people want to see Great Blue Hole. In particular, this place is home to several shark species including Caribbean reef sharks, nurse sharks, hammerheads, bull sharks, and black tip sharks.
Believed to be the world's largest feature of its kind, the Great Blue Hole is part of the larger Belize Barrier Reef Reserve System, a World Heritage site of the United Nations Educational, Scientific and Cultural Organization (UNESCO).
Option 2: Scuba diving in the Great Blue Hole Belize. The other way to experience the Great Blue Hole Belize is by scuba diving inside the hole. This of course gives you the experience of seeing inside this incredible sinkhole, not viewing it from above.
The main big swimming hole when you first enter the park is absolutely deep enough to swim in. Divers have reportedly measured some spots as deep as 20 feet. But it's so freezing cold, between 50-60 degrees in the midst of summer, that you won't want to stay shoulder-deep for long.