The final episode of Blue Planet II focused on the damage being done to our oceans, and how we can help. Were you watching closely? Take the quiz!

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 ...

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.