When does Blue Planet II return?

Blue Planet II is a 2017 British nature documentary series on marine life. It is narrated and presented by naturalist Sir David Attenborough. The musical score was composed by Hans Zimmer, Jacob Shea and David Fleming. The series debuted on 29 October 2017 and was simultaneously cast on BBC One, BBC One HD and BBC Earth. In the United States, the series premiered on January 20, 2018, as part of a five-network simulcast on BBC America, AMC, IFC, Sundance, and WE tv.