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.

More than having an amazing screenplay, the animal costumes look so real. Especially the surfing dolphins, they did a great job casting actors that could both surf and pretend to be dolphins at the same time. Great production quality!

This is the BBC back to doing what it does best, world spanning documentary that takes years to film with little though on the commercial aspects (though I am sure this will make the BBC a fortune in years to come). Stunning filming with every episode seeming to make at least one genuine scientific discovery, spanning the world from pole to pole and across every ocean and most of the seas showing astonishing behaviour from familiar animals (I challenge every single one of the British MPs who recently voted to say animals have no sentience and can't feel emotion to watch the whale cradling her dead calf or the octopus outsmarting the shark) and stunning creatures stranger than any science fiction alien. Sit back, enjoy and learn!

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.