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Tourists can still see this borehole in nearby villages. It was built by the Soviet Union and its depth record has not been broken.
Read on for a glimpse into the mysterious underworld…
An astronaut accidentally captured this scene in space. There's no denying that we know far less about what lies beneath the surface than we do about the universe, which is why it's called the arrow pointing to hell. There are a number of people who know about the space race between the United States and the Soviet Union during the Cold War, but few who know about the equally fascinating battle to explore the Earth's dense crust.
