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In 2020, the most ambitious drilling project in history is under way. Dr Nasreen Chaudry and her team have reached 21 kilometers into the Earth's crust - but something is stirring far below. Amy Pond discovers there's nowhere to run when you can't even trust the ground at your feet.
First Air Date : Mar 26, 2005
Last Air date : Dec 05, 2021
Episode : 153 Episode
Season : 13 Season
Runtime: 26:14 minutes
Studio: BBC One
Country: Canada, United Kingdom