(CNN) -- Before the storm hit and the floodwaters took over, Kimberly Rivers Roberts pulled out her new video camera.



Kimberly Rivers Roberts and her husband, Scott, sit outside their flood-damaged Ninth Ward home.



The aspiring rapper and her husband, Scott, were among those trapped in the Ninth Ward in New Orleans, Louisiana, in late August 2005 as Hurricane Katrina raged toward them.



The couple, who've described themselves as street hustlers, compiled amateur footage that captured the horrors experienced in their community and among their neighbors. From the middle of rising waters in attics where people waited to the struggles to find help from and for others, they documented what outsiders couldn't see.



About 1,300 miles away, in Brooklyn, New York, documentary filmmakers Tia Lessin and Carl Deal sat glued to their televisions.



"After a few days of seeing people stranded on roofs, we had to do something," said Lessin, who with Deal had previously worked with Michael Moore.  Watch Lessin and Deal talk about how the film was made »



So they set out, planning to do a film about New Orleans National Guardsmen. But when that was shut down -- " 'Fahrenheit 9/11' screwed it up for all you guys," she remembered hearing -- they found what she called "an unexpected gift" in Kim and Scott, whom they met 10 days after the storm.



The home video material, coupled with archival news footage and film verite capturing the couple's journey, led to the documentary "Trouble the Water," which won the Grand Jury Prize at the 2008 Sundance Film Festival and is up for an Oscar at this year's Academy Awards.



Lessin and Deal, who both directed and produced this documentary that took two-and-a-half years to make, spoke to CNN about their Ninth Ward collaborators, their own experiences and the impact the film's made.



CNN: Tell me about meeting Kim and Scott. Did you know right away that you were on to something?



Tia Lessin: We were in a Red Cross shelter in central Louisiana -- that's where we met the subjects, the hero[es] of our film. They'd been on this five-day journey out of the city to higher ground. ... Everyone had a story to tell, but their story really rose to the top.



Carl Deal: They called themselves "street survivors." Kim said the most support and help they ever got from the government were the skills to survive on their own. They were used to not getting assistance. ... It's a slap in the face for those of us who come from a more privileged place. ... And the home video, it enabled us to ground the film in this inside point of view.



CNN: I can't imagine what it was like to work on this. What was this experience like for you?



Lessin: Originally the film was fueled by a sense of outrage. What it became, I guess, was something a little different. It's really about hope and survival. We were inspired by Kim and Scott's journey, and their commitment to do something different in their lives. The voices on 911 calls, we think about those people all the time, and there's no way to know what happened to them. What keeps us up at night now is that people are still struggling. Levees are still vulnerable, there's a lack of affordable housing, lack of jobs. Schools are a dismal failure. Tens of thousands of people can't return home. We hope in this new administration, things will happen.



CNN: What did you hope this film would inspire in terms of emotion and action?



Deal: We want to challenge people, when they see it, to think about themselves and the impact they can have in the community and the world.



People respond to this film in different ways. We screened at the Democratic National Convention in Denver. Mayor [Ray] Nagin [of New Orleans] came to the screening and walked out after a few minutes. Sen.
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question: In which New Orleans ward was horrific video footage of Hurricane Katrina captured?, answer: Ninth | question: what is the story about, answer: the documentary "Trouble the Water," | question: The New Orleans footage was used in which film?, answer: "Trouble the Water," | question: Trouble the Water was made by which filmmakers?, answer: Tia Lessin and Carl Deal | question: who made the film, answer: Kimberly Rivers Roberts and her husband, Scott, | question: What Oscar-nominated film was based on the video horrors of Hurricane Katrina?, answer: "Trouble the Water," | question: What did the Ninth Ward couple capture on video?, answer: captured the horrors experienced in their community and among their neighbors. | question: what film used the footage, answer: "Trouble the Water," | question: What do the filmmakers hope to inspire?, answer: challenge people,