A cave diver drops into the depths of The Pit, a gaping cavity dissolved into the limestone bedrock of the Yucatan Peninsula. Stalactites hanging from the cave's ceiling indicate that this cave was once dry, as stalactites can only form where water drips into air-filled caves. Indeed, all of the Yucatan's known caves were air filled 20,000 years ago when ice sheets stretched across North America and Europe and lowered sea levels by more than 125 meters relative to today.
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