Watch Doctor Who Season 5 Episode 6 Cold Blood 2

Watch Doctor Who Season 5 Episode 6 Cold Blood 2

Summary: In 2015, 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