Blue Planet II is a 2017 British nature documentary series on marine life produced by the BBC Natural History Unit. Like its predecessor, The Blue Planet (2001), it is narrated and presented by naturalist Sir David Attenborough. After being announced in 2013, filming took four years in 39 countries over more than 125 international trips. The musical score was composed by Hans Zimmer, Jacob Shea and David Fleming, and English rock band Radiohead reworked their 2011 song "Bloom" with Zimmer specifically for the series.