The oceans, seemingly limitless, invoke in us a sense of awe and wonder and also, sometimes, fear.

Hidden beneath the waves, right beneath my feet, there are creatures beyond our imagination.

They cover 70% of the surface of our planet and yet they are still the least explored.

With revolutionary technology, we can enter new worlds and shine a light on behaviours in ways that were impossible just a generation ago.

We've also recognised an uncomfortable fact, the health of our oceans is under threat.

They are changing at a faster rate than ever before in human history.

Never has there been a more crucial time to reveal what is going on beneath the surface of the seas.

In this first episode, we will journey across the globe from the warm waters of the Tropics to the coldest around the poles, to bring us a new understanding of life beneath the waves.

The surface of the ocean conceals many creatures that live beneath. But not all.

Bottlenose dolphins. They are extremely intelligent. And with this intelligence comes playfulness.