Scientists often claim that humanity understands more about distant planets than it does about the world beneath its own feet, and the Soviet Union’s Kola Superdeep Borehole became the most haunting ...

In 1970, Soviet scientists embarked on an ambitious quest to dig into the Earth's crust, creating the world-renowned Kola Superdeep Borehole in the remote Murmansk Oblast, Russia. Stretching 12,262 ...