Transcript for scene 40 of the video " Ice Age 2050s: Certainty 1" by Rolf Witzsche  

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Vostock had drilled its first deep hole in 1990

Vostock had drilled its first deep hole in 1990, 2,200 meters deep into the ice. This was a big achievement. The retrieved samples cover a period of 150,000 years into the past. Later drilling reached a depth of 3623 meters in 1996, which cut through 420,000 years of ice accumulation, spanning almost 4 full glaciation cycles.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche