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| Kola Superdeep Borehole. Image courtesy Andre Belozeroff, CC BY-SA 3.0 via Wikimedia Commons. |
I was listening to this in the early hours of the morning. Witness History is a short factual insert in the BBC World Service schedule in which the interviewer speaks to someone who was present at events of historical importance. In this program, the presenter Rachel Naylor was talking with Prof David Smythe, a geophysicist who worked at the Kola Superdeep Borehole site in Russia for four months. The borehole was drilled to a depth of 12 km.