n recent years, our knowledge of life in the oceans has developed immensely. Blue Planet II, sequel to the highly successful documentary series The Blue Planet, takes the latest breakthroughs in science and technology as the starting point for an exciting journey of discovery. We visit deep seas, coral reefs, the open ocean and green coasts. We are introduced to amazing creatures and witness animal behavior that no one has ever seen. But what we now also know is that the health of the oceans is under threat. So now is the time to explore that vast world and investigate what the future of our "Blue Planet" looks like.