BBC Earth's Blue Planet II explored the immense wonders of the deep. Now the team is back to celebrate marine life from all corners of the world and investigate the health of our oceans.

Now 15 years later David Attenborough returns to the narrators chair as Blue Planet II re-explores the deep in stunning detail. Photo credit: (c) BBC / Lisa Labinjoh / Joe Platko 2017 ...

Take a look behind the scenes of making Blue Planet II and further uncover our ... exclusive access and a fascinating look at the deep sea. Presented by Becky Ripley and Emily Knight.

Keep reading to learn more about Earth's different layers, its atmosphere, and what makes the "blue planet" unique. Earth is made out of different layers, and those layers get hotter and more ...