What’s at the Bottom of the Deepest Hole on Earth?

Question: What's the highest mountain on Earth? Would you say Mount Everest? Give yourself a point. Now, let's ask the opposite: what's the deepest hole on Earth? Some smart alecs among you might be saying The Mariana Trench, but that’s wrong. There exists a hole so deep that it exceeds the deepest depth of the famous Mariana Trench, and shockingly, it was dug out by humans! However, what they found at the bottom no one expected. What did they find? How deep did they go? And how deep have we dug before? Let's explore some of the deepest holes on earth, and what lies at the bottom of them!  

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