Kola Superdeep Borehole
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The Kola Superdeep Borehole () is the result of a scientific drilling project of the Soviet Union on the Kola Peninsula. The project attempted to drill as deep as possible into the Earth's crust. Drilling began on 24 May 1970 using the Uralmash-4E, and later the Uralmash-15000 series drilling rig. A number of boreholes were drilled by branching from a central hole. The deepest, SG-3, reached (12.26 km, 2.21 leagues) in 1989, and is the deepest hole ever drilled, and the deepest artificial point on Earth. For two decades it was also the world's longest borehole, in terms of measured depth along the well bore, until surpassed in 2008 by long Al Shaheen oil well in Qatar, and in 2011 by 12,345 metres long Sakhalin-I Odoptu OP-11 Well (offshore the Russian island Sakhalin).
- Related: Chikyū, Earthscope, Extreme points of Earth, Mohorovičić discontinuity, USARRAY, Well to Hell hoax
| Official Kola Superdeep Borehole website (in Russi... Official Kola Superdeep Borehole website (in Russian) superdeep.pechenga.ru - Web |
| The World's Deepest Hole – Alaska Science Forum – ... The World's Deepest Hole – Alaska Science Forum – July 1985 www.gi.alaska.edu/ScienceForum/ASF7/725.html - Web |
| The Deepest Hole The Deepest Hole www.damninteresting.com/?p=567 - Web |
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