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 meters (40, ...

The Kola Superdeep Borehole, dug during the Cold War, remains the deepest hole ever made by humanity. In this video, we ...

The official name for the so-called "well to hell" is the Kola Superdeep Borehole SG-3 – but that's not as catchy. It's currently the deepest man-made hole on Earth, reaching a dizzying 40,230 ...

Rachel Naylor speaks to geologist Professor David Smythe, who worked at the Kola Superdeep Borehole for four months. Presented and produced by Rachel Naylor for the BBC World Service.