This Perfect Blue Circle in the Ocean Hides a Mind-Blowing 400-Foot Deep Secret
The Great Blue Hole of Belize appears to be a perfect circle of deep blue water, but this 407-foot-deep formation was once a massive limestone cave system during the last ice age. When sea levels rose at the end of the ice age, the cave’s roof collapsed, creating this spectacular underwater time capsule that preserves evidence of Earth’s ancient past.
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