Tropical Seas Launch Blue Planet III Series
The third installment of the BBC’s long-running natural history series, Blue Planet III, premieres on BBC One this Sunday at 8 p.m. Narrated by Sir David Attenborough, the series returns to explore the world’s oceans, beginning with the tropical seas. According to the BBC, this opening episode examines how constant sunlight in equatorial regions creates some of the most diverse and competitive marine environments on Earth. The Guardian reported that viewers can expect to see tawny nurse sharks employing group-hunting strategies and complex interactions between shrimps and starfish.
Marine Biology Research Informs New Footage
The production of Blue Planet III involved collaboration with marine scientists to capture animal behaviors that were previously undocumented or impossible to film. Three biologists from the University of Southampton—Professor Jon Copley, Dr. Ryan Reisinger, and Professor Clive Trueman—advised the BBC Natural History Unit on the series. Dr. Reisinger provided expertise on large marine mammals and sharks, drawing on his recent research expeditions to the Western Antarctic Peninsula. Professor Copley, who also contributed to the previous series, consulted on the episode focusing on the deep ocean.
Blue Planet III is coming – and Sir David Attenborough is providing narration for the new series!Sneak peek ➡️ https://t.co/xiMraMRp10 pic.twitter.com/dLNtPzWABm
Scientific Discoveries Behind Ocean Behavior
The series documents advanced animal behaviors, including tool use in marine species. As noted by Kent Online, bottlenose dolphins have been filmed using sea sponges to block holes in coral reefs to trap fish. The programme also highlights the impact of climate change on these habitats, such as an unprecedented marine heatwave in the Coral Triangle that caused significant bleaching in corals and anemones. While the series focuses on the wonder of the underwater world, it also explores themes of resilience and recovery, according to the University of Southampton.
Sunday Night Broadcast Schedule
Blue Planet III leads a slate of programming on BBC One and BBC Two this Sunday. The schedule includes:

| Program | Time | Channel |
|---|---|---|
| BBC Young Musician: The Final | 7 p.m. | BBC Two |
| Blue Planet III | 8 p.m. | BBC One |
| This City Is Ours | 9 p.m. | BBC One |
| Mortimer & Whitehouse: Gone Fishing | 9 p.m. | BBC Two |
This City Is Ours continues its crime drama narrative at 9 p.m., while the ninth season of Mortimer & Whitehouse: Gone Fishing features a tribute to the hosts’ late dog, Ted.
Frequently Asked Questions
How does the filming technology in the new series differ from previous installments?
The production team utilized a new generation of camera technology to capture behaviors that were previously impossible to film or only recently discovered by scientists, according to the University of Southampton.
Which habitats does the series cover?
The six-part series focuses on five key habitats: tropical seas, open ocean, seasonal seas, polar waters, and the deep ocean, with the final episode dedicated to the future of marine conservation.
Are there any unresolved storylines in the Sunday evening drama?
In This City Is Ours, the plot remains centered on Michael’s ultimatum and the Phelans’ ongoing search for a character named Banksey, leaving the outcome of these conflicts to be determined in the third episode, The Guardian reported.