an international team which retrieved a record-breaking 1,268m-long drill core (a long cylindrical sample of rock collected by the drill) of mantle rock from the seabed. This sample, which is more than six times longer than the previous core of mantle rock, has given us a glimpse into the composition of this mostly inaccessible layer of the Earth.
The Kola Superdeep Borehole runs about 40,230 feet (12,262 meters) or 7.6 miles (12.2 kilometers) into Earth's surface.
According to BBC Future, drilling reportedly stopped when temperatures at the bottom of the hole reached a sizzling 180°C (or 356°F), drastically higher than their models predicted.
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He’s a weirdo
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