Mark Dalio

Embark on a global odyssey to discover the largest and least explored habitat on earth. New ocean science and technology has allowed us to go further into the unknown than we ever thought possible.

On a summer's night, there's nothing more magic than watching the soft glow of fireflies switching on and off. Few other life forms on land can light up the night, but in the dark depths of the oceans, it's a different story: nearly 90% of all species shine from within. Whether it's to scare off predators, fish for prey, or lure a mate, the language of light is everywhere in the ocean depths, and scientists are finally starting to decode it.

A journey into the extraordinary life and legacy of pioneering marine biologist Edie Widder.

Traveling aboard the OceanXplorer, OceanX's state-of-the-art scientific research and exploration vessel, to investigate the farthest frontiers of the world's oceans, 80% of which are entirely unknown. Armed with advanced technology, a hand-picked team of intrepid explorers and scientists, National Geographic Explorers and other ocean experts embark on a global odyssey to solve some of the ocean's greatest mysteries through the lives of its animals and their ecosystems.