The deepest man-made hole on Earth is no longer a gaping wound in the Arctic rock but a quiet, sealed scar. Once hyped as a literal “entrance to hell” in feverish urban legends, the Kola Superdeep ...

On a remote, windswept stretch of Arctic tundra in the far north of Russia, near the border with Norway, there sits a rusted metal cap bolted over a hole in the ground. It is unremarkable to look at, ...

Soviet engineers drilled 12,262 meters into the Kola Peninsula in 1989, but 414°F heat made the rock squeeze the hole shut.

Business Insider visited drilling sites and spoke with engineers and industry experts to understand what it would take to go deeper than ever before, and whether reaching the Earth’s mantle is even ...

Add Yahoo as a preferred source to see more of our stories on Google. The deepest hole humans have ever drilled into the Earth is just 12.3 kilometers, about 0.2% of the distance to the planet's core.

"Hearst Magazines and AOL may earn commission or revenue on some items through these links." This man-made hole was one of them. When physical, financial, and technological constraints ended the ...

Remove this rusted metal cap and the world’s deepest hole tunnels miles into the Earth. However, we know more about certain distant galaxies than we do about what lies miles beneath our very own feet.