Underneath the surface of the Belize Blue Hole, the explorers found evidence of a hollow interior filled with stalactites and stalagmites. These stalactites acted as veritable proof for the explorers to conclude that the Hole was a swallow hole.
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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.
You don't need to be a recreational diver to travel to the Great Blue Hole to take in all that it has to offer. The experience can be just as magical and unique. You can still swim in the beautiful calm blue water and appreciate how lucky you are to visit such an incredible destination.
Within this small sea of light colors, however, lies a giant circle of deep blue. Roughly 300 meters (1,000 feet) across and 125 meters (400 feet) deep, the feature is known as the Great Blue Hole.
Scientists believe the cave formed during the last Ice Age, which ended about 14,000 years ago. The cave flooded and collapsed as the Ice Age ended and sea levels began to rise, leaving behind the Blue Hole we see today. Researchers also predict it won't be around forever.
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).