A Life Illuminated: Diving Into the Deep Sea

Marine biologist Dr. Edie Widder has spent decades documenting deep-ocean bioluminescence. She founded the Ocean Research & Conservation Association (ORCA) and invented devices such as an “eye-in-the-sea” system that uses far-red illumination to avoid disturbing organisms. Widder also created an “electronic jellyfish” lure that attracted deep-sea creatures, enabling the first live footage of a giant squid—an animal the film describes as “somewhere between 2-4 storeys tall.” Her work has revealed a “language of light” that may be the most common form of communication on the planet.

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Director Tasha Van Zandt descended more than 3,000 feet (over half a mile) in a submersible to capture Widder’s research. The final “flashback effect” sequence was shot at an ISO of 100,000, far beyond the typical ISO 800 used in daylight, illustrating the extreme light sensitivity required. Cinematographer-producer Sebastian Zeck noted that filming in complete darkness from a submersible posed a “huge technical challenge,” yet the crew succeeded on their last dive.

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The documentary premiered at the Toronto International Film Festival on September 7, 2025 and subsequently screened at festivals in Maine, Arkansas, Copenhagen and elsewhere. Its theatrical run began on July 24 at DCTV Firehouse Cinema in Manhattan, followed by a showing at the Roxie Theater in San Francisco, where a Q&A was moderated by oceanographer Sylvia Earle.

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Van Zandt described the experience as a test of “curiosity over fear,” emphasizing that Widder’s encouragement to focus on curiosity guided the team during the final dive. Zeck highlighted the collaborative effort that allowed the technically demanding deep-sea footage to come together.

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• “Edie actually says, ‘Because so much of our ocean world is bioluminescent and the ocean is so vast, bioluminescence may be the most common form of communication on our planet,’” — Van Zandt, director

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• “Filming in the deep sea in complete darkness from a submersible is a huge technical challenge, but everything sort of came together on that very last dive,” — Sebastian Zeck

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• “Going into the [final] dive… one of my greatest fears was how would I respond, if I would feel fearful, if I would panic. And she kept saying to us, ‘Just focus on curiosity instead of fear.’ And when we went down on the dive, that was really the guiding factor. There were definitely moments where I had to say, ‘Curiosity over fear, curiosity over fear,’” — Van Zandt, director

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