We have barely begun to explore it, and yet it is the largest living space on the planet. Scientists already think that there is more life in the deep than anywhere else on Earth. This episode ...

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.

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.

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 ...