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among the largest physical structures on the planet | |
In 1970, the Soviet Union embarked on what was arguably one of the most ambitious exploration projects in human history – they attempted to drill as far as possible into the Earth"s crust. This solid layer of rock, which sits above the mostly solid mantle and, eventually, the Earth"s partially molten core, is the only part of the planet that has ever been seen by human eyes. No one knew what would happen if they tried to get through it. | |
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