Away from the BBC, the documentarian takes aim at the greedy corporations causing overfishing in this angry yet hopeful film

To learn more about the making of the film, Popular Science sat down with Toby Nowlan, one of the film’s directors, and marine ecologist and National Geographic Explorer Enric Sala. Answers have been condensed for clarity. Laura Baisas: What was the most surprising thing you learned about our oceans throughout the course of working on the film?

Butfield, who besides co-directing the documentary also wrote the book "Ocean: Earth's Last Wilderness" with Attenborough, believes the British broadcaster's life closely mirrors the ocean’s journey of exploration and discovery.