After 15,000 years, it's waking up

Why did the US military dig a tunnel in the Alaskan tundra? What is the tunnel used for now?
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If you liked this video check out these:
A picture of the beginning of the universe
→ https://www.youtube.com/watch?v=rut6f...
Why is the Universe Flat? ft. Prof Alan Guth
→ https://www.youtube.com/watch?v=MTUsO...

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