Science. The article: "The most intriguing discovery made by the Kola Superdeep Borehole researchers was the detection of microscopic plankton fossils four miles beneath the surface of the earth." and "The Kola Core Repository in the nearby town of Zapolyarny displays rock samples obtained during the drilling operation"
Unrelated: what surprised me reading http://en.wikipedia.org/wiki/Kola_Superdeep_Borehole was that a more recent borehole drilled 10 km (horizontally) within 36 days. That's over 10 meters an hour, kept going for over a month.
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Science. The article: "The most intriguing discovery made by the Kola Superdeep Borehole researchers was the detection of microscopic plankton fossils four miles beneath the surface of the earth." and "The Kola Core Repository in the nearby town of Zapolyarny displays rock samples obtained during the drilling operation"
Unrelated: what surprised me reading http://en.wikipedia.org/wiki/Kola_Superdeep_Borehole was that a more recent borehole drilled 10 km (horizontally) within 36 days. That's over 10 meters an hour, kept going for over a month.