The deepest hole in the world, and what we’ve learned from it

Published on May 5, 2014 by SciShow
SciShow takes you down the deepest hole in the world — Russia’s Kola Superdeep Borehole — explaining who dug it and why, and what we learned about Earth in the process. Don’t fall!
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Sources:
http://www.atlasobscura.com/places/kola-superdeep-borehole
http://www2.gi.alaska.edu/ScienceForum/ASF7/725.html
http://www.damninteresting.com/the-deepest-hole/
http://www.wirelinedrilling.com/sites/default/files/Kozlovsky%20Kola%20Deepest%20Well%20.pdf
http://www.csmonitor.com/1985/0822/drock.html
http://www.nytimes.com/1981/09/29/science/russians-plan-dramatic-expansion-of-effort-in-earth-drilling.html

Location of Kola well and other Soviet deep bore project sites