David Attenborough will narrate the upcoming nature series, Blue Planet III. This marks a return for BBC Earth to ocean documentaries after 25 years. A preview video has been released, showcasing diverse and stunning marine life. The soundtrack for the preview features music by Hans Zimmer and Jade Thirwall. Blue Planet II, its predecessor, was highly acclaimed and considered a masterpiece by critics. That series involved extensive travel and filming to capture extraordinary underwater footage. Attenborough's distinctive narration was a key element of Blue Planet II's success. Blue Planet III is expected to deliver similarly breathtaking sequences and insights. The series is scheduled to premiere in the UK later this year. Specific release dates for other regions are not yet confirmed.