Originally published at: http://www.howtogeek.com/188647/the-deepest-hole-in-the-world-and-what-we-have-learned-from-it/
There are deep holes, and then there are really deep holes like the Kola Superdeep Borehole in Russia! The Kola Superdeep Borehole holds the world’s record as the deepest hole ever made by humans and was twenty-four years in the making, but why was it dug? Learn the answers to this question and more in today’s video from YouTube channel SciShow!
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