For 24 years the USSR drilled a single hole into the Kola Peninsula, aiming for the mantle and stopping at 12,262 meters when the rock turned to hot plastic. They found two-billion-year-old microfossils and water where none should exist — and somewhere along the way the world decided they'd drilled into Hell and recorded the screaming.
The full engineering saga: why the Soviets started drilling in 1970, the impossible heat that ended it in 1994, and why the deepest point on Earth is now a rusted metal cap welded shut in the Arctic.
The hard numbers: 12,262 m deep, a hole barely 23 cm wide, and rock hotter than 180 degrees C — so hot the drill couldn't advance because the crust behaved like putty.
SciShow on the actual science payoff — the surprises that overturned assumptions about what the crust is made of just a few kilometers beneath our feet.
They expected the granite to give way to basalt. Instead they found cracked, water-saturated rock all the way down — free water where geology said there could be none.
Four miles down, sealed in ancient rock, sat microscopic plankton fossils from roughly 24 species — organic matter that somehow survived the crushing pressure and heat of the deep crust.
By the early 90s a story spread that the drillers broke into a cavern, lowered a microphone, and heard the tormented screams of the damned. Snopes traces how a real hole became the internet's favorite ghost story.
A crisp retelling that threads the real project and the myth together — including how the 'hell screams' were traced to a looped scream from a 1972 Italian horror film.