It's the deepest man-made hole on Earth, made in a project between May ... In 1994, drilling officially ceased, and Russia awaited scientific advancements to continue drilling.

Russia’s Kola Superdeep Borehole SG-3 with a vertical depth of 12,262 metres completed in 1989 was regarded as the world’s deepest human-made hole on Earth.

Scientists drilled the deepest hole in human history to uncover the mysteries beneath Earth’s surface. What they found ...

America might have landed on the moon, but Russia drilled the deepest man-made hole on Earth. Since the early 1960s, scientists have attempted to drill down to the Earth's mantle. It took 20 years ...

China’s state-run CNPC claimed to have drilled the deepest vertical well in Asia, reaching a depth of 10,910 meters in the ...