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Take a quick tour of the worldâs largest pothole. Click play below. The worldâs largest pothole also happens to be the most popular pothole in Pennsylvania. But, Archbald Pothole isnât the only natural wonder in Pennsylvania. Check out this natural phenomenon in Pennsylvania that will absolutely blow you away. Click here to read more.
In 1970, Soviet geologists took on the challenge, setting their drills over the Kola Peninsula, which juts eastward out of the Scandinavian landmass. The Kola Superdeep Borehole was just 9 inches in diameter, but at 40,230 feet (12,262 meters) reigns as the deepest hole. It took almost 20 years to reach that 7.5-mile depthâonly half the distance or less to the mantle. Among the more interesting discoveries: microscopic plankton fossils found at four miles down.