Planet Earth: Blue Planet II

Pioneers strive to protect the ocean from the effects of human activity.

At the coast, two worlds collide. Coasts is the story of how our wildlife survives in this ever-changing world. It's a roller-coaster ride of heart-stopping action and epic drama, with characters from beautiful to bizarre.

In green seas, competition is fierce. Sunlight powers vast kelp forests, mangroves, prairies of seagrass and blooms of algae. Here, animals must fight for space and food. In kelp forests, a common octopus must become the ultimate escape artist.

The Big Blue is a marine desert, far from shore, miles deep, with almost nothing to eat and home to some of the largest creatures on Earth; special pressure-proofed cameras capture Sperm whales on the hunt for squid 3,000 feet down.

Coral reefs are home to one-quarter of all marine species and survival in these undersea megacities is a challenge with many different solutions; a turtle heads to the reef's equivalent of a health spa, but she must use trickery to avoid the queue.

Life exists in nearly every part of the oceans, and the different regions present unique challenges for its inhabitants.

The Big Blue is a marine desert, far from shore, miles deep, with almost nothing to eat and home to some of the largest creatures on Earth; special pressure-proofed cameras capture Sperm whales on the hunt for squid 3,000 feet down.

At the coast, two worlds collide. Coasts is the story of how our wildlife survives in this ever-changing world. It's a roller-coaster ride of heart-stopping action and epic drama, with characters from beautiful to bizarre.

Coral reefs are home to one-quarter of all marine species and survival in these undersea megacities is a challenge with many different solutions; a turtle heads to the reef's equivalent of a health spa, but she must use trickery to avoid the queue.

In green seas, competition is fierce. Sunlight powers vast kelp forests, mangroves, prairies of seagrass and blooms of algae. Here, animals must fight for space and food. In kelp forests, a common octopus must become the ultimate escape artist.

Life exists in nearly every part of the oceans, and the different regions present unique challenges for its inhabitants.

Pioneers strive to protect the ocean from the effects of human activity.