In 2001 BBC documentary Blue Planet broke the mould. Now 15 years later David Attenborough returns to the narrators chair as Blue Planet II re-explores the deep in stunning detail.

A year after the epic Planet Earth ... up to 2001's Blue Planet. No spoilers, but we've seen the first episode and as sequels go we can confirm it's better than Sex And The City 2.

The people behind Blue Planet 2 say there was rarely a time when they were filming that they didn't come across plastic in the sea. This week's episode focuses on how plastic affects sea creatures.