Russia’s Kola Superdeep Borehole – the deepest hole in the World

Russia’s Kola Superdeep Borehole goes for more than 12 kilometers into Earth’s crust and is, to date, the deepest ever hole drilled by humans. At such depths the temperature is about 180 degrees Centrigrade or over 300 degrees Fahrenheit and the rock behaves like plastic.

Hank Green tells us that the hole took 25 years to be built and was shut close in 1995. The scientists had to invent new devices to make such deep holes. They wanted to find out if they can reach the mantle and to see how it behaves. They could not reach the mantle because Earth’s crust is over 30 kilometers thicks so, we’ll get to the center of the Earth in the future, but not now 😀

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