Sir David Attenborough examines the impact of human activity on our oceans

At the coast, two worlds collide

In our green seas, sunlight powers kelp forests, mangroves, seagrass and algae

The big blue is far from shore, miles deep, and home to some of the most spectacular creatures on Earth

Survival in coral reefs is a challenge with many different solutions

Discover an abundance of life in the pitch-black darkness of the seabed

Embark on a journey from the intense heat of the tropics to the planet's frozen poles