The new film “Ocean With David Attenborough” is both a breathtaking celebration of marine life and a sobering exposé of the industrial forces pushing the ocean toward collapse.

Ocean with David Attenborough' premieres on National Geographic on June 7 David Attenborough wants to help the world's oceans return to their full, majestic glory. To help him achieve this goal, the renowned naturalist and broadcaster,

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?