The project was started during the Cold War era, as the Soviet Union had the ambition to create the deepest man made hole ever. Despite going so deep, the borehole was eventually sealed for ...

It's currently the deepest man-made hole on Earth, reaching a dizzying 40,230 ... don't panic: it's sealed up with a rusty metal lid. Phew. Devil's Sinkhole is a massive cavern near Rocksprings ...

America might have landed on the moon, but Russia drilled the deepest man-made hole on Earth. Since the early 1960s, scientists have attempted to drill down to the Earth's mantle. It took 20 years ...