The deepest hole we have ever dug | The Kola Superdeep Borehole

There’s a portal to the center of the earth in the wreckage of an abandoned project site in Murmansk, Russia. What’s it for? And why is the Internet Googling “Kola Superdeep Borehole screams?” The Kola Superdeep Borehole is the deepest artificial point on Earth. It’s the result of a scientific drilling project of the Soviet Union, with the goal of drilling as deep as possible into the Earth's crust.