Watch this: Blue Planet II

Promo shot from Blue Planet II

Just like the first series, Blue Planet II really made waves. The false killer whales and dolphins catching up on holiday every year, the barreleye fish with a transparent head (WHAT), the 'rockstar' octopus who made her own armour – it was all incredible viewing.

Sir David Attenborough and the BBC conveyed a very serious message though: we humans are doing massive damage to our seas and everything that lives in them. The BBC website has a useful page about the issues explored, and what you can do about it.

It's essential viewing, and re-viewing, and luckily you can watch the whole series on BBC iPlayer for another few weeks.

This is just the trailer, for crying out loud.

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