Sylvia Earle and marine scientists work to protect our oceans’ ecosystem.

Legendary oceanographer Sylvia and a cast of pioneering marine scientists tell the story of the incredible work being undertaken across the planet to protect the fragile ecosystem of our oceans. It’s a showcase of the wonder of the sea, of the living laboratory we all live in and of the vital science being carried out beneath the waves every single day.

Perpetual Planet: Heroes of the Oceans, is on National Geographic Channel, from April 22. Check your local listings.