Guest Stars: Meera Syal, Stephen Morre and Neve McIntosh
In 2015, the most ambitious drilling project in history is under way. Dr Nasreen Chaudhry and her team have reached 21 kilometres 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.
“While you’ve been drilling down… something else has been drilling up.”