WHAT WAS DISCOVERED DEEP UNDERGROUND? THE KOLA SUPERDEEP BOREHOLE

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Science does not have any concrete facts as to what may lurk tens of thousands of metres below the planet’s surface.
In fact, samples of minerals extracted from deep down are as valuable as those delivered from celestial objects by spacecraft.
But what prevents us from going as far down as that and taking a look?
And what has been revealed so far thanks to the deepest manmade well - the Kola Superdeep Borehole?
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