<Tr> <Td_colspan="2"> List of Black Mirror episodes </Td> </Tr> <P> "Crocodile" is the third episode of the fourth series of anthology series Black Mirror . It was written by Charlie Brooker and directed by John Hillcoat . The episode first aired on Netflix, along with the rest of series four, on 29 December 2017 . </P> <P> Filmed in Iceland, the episode centres on Mia (Andrea Riseborough) who is distressed about having helped her friend Rob (Andrew Gower) cover up a hit - and - run death . Fifteen years later, Rob wants to confess their crime, leading Mia to kill him and dispose of his body . Shortly after, Mia witnesses a road accident between a pedestrian and self - driving vehicle . Shazia (Kiran Sonia Sawar) meanwhile is hired to investigate the accident, and uses a Recaller device that allows her to see the recent memories of those she interviews . </P> <P> Mia Nolan (Andrea Riseborough) and Rob (Andrew Gower) go to a club together . While driving home, a drunken Rob hits and kills a cyclist on a mountain road . He convinces Mia to help him cover up the death by throwing the cyclist's body and bicycle into a lake . </P>

Where was season 3 episode 4 of black mirror filmed