SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Rock core samples from the Kola Superdeep Borehole on the Kola Peninsula, Russia. The borehole was a Soviet scientific drilling project which attempted to drill as deep as possible into the Earth's crust. Rock samples were extracted at different levels for analysis by geologists. Drilling began in 1970 and a number of boreholes were drilled branching from a central hole. The deepest reached a depth of 12,262 metres in 1989 and is still the deepest man-made hole on Earth. The project ended in 2006 due to lack of funding. Photographed in 1984.
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