The Outokumpu borehole from above. (IMAGE)

University of Helsinki

The Outokumpu borehole from above.

Caption

The Outokumpu borehole from above. It is a A 2,516-metre deep vertical window, 22 cm in diameter, to crystalline bedrock dating back 1.9 billion years.

Credit

credit: Riikka Kietäväinen

Usage Restrictions

credit: Riikka Kietäväinen

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