WHAT WAS DISCOVERED DEEP UNDERGROUND

WHAT WAS DISCOVERED DEEP UNDERGROUND?
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THE KOLA SUPERDEEP BOREHOLE
1979
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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.
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In fact, samples of minerals extracted from deep down are as valuable as those delivered from celestial objects by spacecraft.
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But what prevents us from going as far down as that and taking a look?
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And what has been revealed so far thanks to the deepest manmade well - the Kola Superdeep
Borehole?