Mount Erebus is the southernmost volcano on Earth and the only active one in Antarctica. Only a handful of people have ever seen it in person.
But it's what lies beneath that took our breath away.
There's a network of caves under the mountain.
Only a few professional cavers have ever attempted to climb down into them.
What did they find? Stunning, one-of-a-kind ice formations that don't exist anywhere else on the planet.
The heat from the volcano meets the icy walls inside the cave...
...and the moisture in the air freezes into these spectacular shapes.
The crystals are so unusual that scientists are investigating them.
There's a small possibility that they're formed by a bacteria living inside the ice.
The bacteria are called "extremophiles," named for their ability to live in extreme environments.
Whatever created them, we hope it continues so we can see more of these incredible, dazzling formations. It's truly one of the most beautiful places on earth.
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