The Deep - Episode 3 preview

Watch a preview of Episode 3 of BBC One's new thriller series The Deep, set thousands of feet below the Arctic ice.

> Watch a recap of Episode 2.

> Read our Episode 1 review.

> Find out spoilers in our episode guide.

In Episode 3, The Orpheus crew's quest for renewable energy has led them into danger. They're trapped on Volos, a Russian submarine, and its nuclear reactor is dangerously overheating. Whoever shuts it down will be exposed to lethal radiation. Who will draw the short straw?