I have a question… what if I just dug a really deep hole? That’s what the USSR did in 1970. This hole is 7.6 miles or 12.2 kilometers deep, making it deeper than the deepest part of the ocean and deeper than Mt. Everest is tall. br br It was part of a race to see who could retrieve a sample from Earth’s mantle first - kind of like the space race, but DOWN. Here's what they found... br br Humanity’s deepest hole is only 0.002 of the way to the middle of the Earth. There’s still so much left to learn about our own planet.