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).
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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.
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.