To me, this movie is perfection.

In truth, there is barely enough story here to make a film.

Good films always raise compelling questions, whether the format is fiction or documentary fact.

This film is so real. It treats its characters with so much care and sensitivity.

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 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 is by far the best BBC Natural History program I have watched this year(besides Spy in the Wild). It just keeps getting better. Especially with Attenborough, Zimmer, Buck Taylor, and everyone else. For me, and possibly others, this is a solid 10/10. As I write this, One Ocean and The Deep have already come out. It truly is a window of hope in a world being destroyed before us.

Anyone who saw the first installment remembers the feeling of awe they had, listening to David telling us of the Deep Blue. Somehow they have outdone this. The mysteries of the ocean are unveiled in this masterpiece of film in which I feel is an unparalleled feat of modern cinematography. Can give it no higher praise, an educational delight and simply unmissable.