Zimmer composed the main theme for the 2016 BBC nature documentary "Planet Earth II", presented by David Attenborough. He later composed the score for the 2017 BBC nature documentary "Blue Planet II" alongside Jacob Shea and David Fleming, also presented by David Attenborough. Zimmer composed the main theme for the 2016 Netflix production "The Crown". Also in 2016 Zimmer released an online course teaching the basics of film scoring. He next composed the score for Christopher Nolan's 2017 film "Dunkirk", basing part of the score on a recording of a ticking watch that he had been given by Nolan. Zimmer also worked on the score for Denis Villeneuve's "Blade Runner 2049". Hans Zimmer and co-composer Benjamin Wallfisch took over scoring duties after Jóhann Jóhannsson left the project.