Earth’s deepest artificial hole stretches 40,000 feet below the surface and it’s only covered by a rusty metal lid.
According to legend, a team of Russian geologists drilled an 8.9-mile hole into the permafrost-covered ground of a remote region of Siberia. When they neared the 9-mile point, however, their drill bit began to spin wildly, indicating that it had broken through into a larger area.
Drilling the Kola Superdeep Borehole was, for the most part, purely science-driven. Soviet scientists wanted to learn more about our planet’s outermost layer, called the crust, to understand how that crust has formed and how it evolved.
To the surprise of the geologists, the temperatures in the hole measured an incredible 2,000 degrees Fahrenheit. The microphones returned something even more astounding: the sounds of wailing human voices.
Locals in the area say that the hole is so deep you can hear the screams of people being tortured in hell, hence its nickname being “the well to hell.”
If you fell down the hole, it would take around 3.5 to 4 minutes to reach the bottom. Lot of countries wanted to be the first to drill into the Earth’s mantle during the Cold War and today Japan is attempting to set this record.