The BBC produces amazing documentaries and one of the most well-known is the Blue Planet series. There are two series which were both produced by Sir David Attenborough – an English broadcaster, biologist, natural historian and author. Most recently his work has concentrated on supporting environmental causes. He has advocated for restoring planetary biodiversity, limiting population growth, switching to renewable energy, mitigating climate change, reducing meat consumption, and setting aside more areas for natural preservation.
Here is the link to the BBC webpage about the series : BBC Earth
Here you can watch a series of videos taken from the series:
And here you can watch all the series online : watch documentaries