She was the first marine biologist to film a giant squid in its habitat. . Edie Widder is a pioneering marine biologist who believes the light in the dark ocean may actually be a form of communication. She has dedicated her life to understanding the phenomenon known as bioluminescence. And she is one of the few people in the world who has been to the deepest 'twilight zone' of the ocean using tiny submersibles.

Matt talks to Widder about her quest to capture the bioluminescence on video along with Tasha Van Zandt, director of a new documentary about Widder's life and work.

A Life Illuminated is screening as part of the Toronto International Film Festival.

Bioluminescence: The secret language of light