This series explores, with stunning video footage, the range of underwater habitats that make up our fragile blue planet. Despite making up 70% of the Earth our oceans are still poorly understood. David Attenborough and his BBC team do an excellent job of educating us about the interactions that are taking place in the depths of the oceans and in the shallows of coral reefs. The final episode should be required viewing for everyone. It tells of the immediate issues that need to be addressed if we are to restore the health of the oceans. A place that provides over half the oxygen that we breathe has to be a top priority. David Attenborough tells us how we all can help. There is no time to waste - reduce your carbon dioxide output to cut back on global warming and ocean acidification and use less plastic which has proved a major hazard to ocean life.

A fantastic series with brilliant filming, David Attenborough is great as ever. Very good how they showed the impact of humans to the seas and oceans.

This series had me reaching for the thesaurus as I simply don't have enough words to encompass its utter brilliance. Time after time I caught myself exclaiming out loud "OMG" or "whooaaah" - inarticulate I know but so overwhelming is the impact the brain cannot cope. The only documentary to ever come close in Planet Earth II from the same source - it's difficult to imagine anything topping this duo, ever.This time around there is more storytelling to accompany the visual feast, and its a welcome enhancement. The sad and devastating truth is that this may be the last time the ocean looks this way - if we let it degrade our descendants will rightly despise us.You must see this - there are no excuses.

Much will probably be discussed about the genuinely stunning photography in this series but it cannot be underplayed enough: it is imperious.Beautiful, beautiful shots of wonderful creatures going about their daily lives, together with informative narration and innovation. All rounded off accompanied by a blockbuster-movie-standard score which soars and settles with the visuals.This series took around four years to film, and I can only imagine what the poor editors had to leave out.Worthy of a mention is the astounding super-slow motion on display. In oceans so vast, we can see single droplets! It is a brilliant series for all ages.The BBC is unsurpassed at this type of documentary. And to think, the BBC costs UK taxpayers about 50 pence per day and some people think it should be cut down/split up/privatised. I really hope this doesn't happen as, yes, the BBC has faults like many broadcasters, but when it does something like this, it really cannot be beaten.Watch this with your children, or your partner, or on you own. It doesn't matter, just watch it. And experience some awe.