"I was so little and I was shaking. I found myself next to dead people ... I am a survivor of the Nanjing Massacre."

As Xia Shuqin, 88, speaks on screen, she shares her haunting memories with her granddaughter, her seven-year-old great-grandson, with Chris Magee, the grandson of the missionary who captured her image eight decades earlier during the massacre, and with American moviegoers in an Orange County theater.

Many Americans are unaware of one of the worst atrocities in China's long history: the Nanjing Massacre of Chinese civilians by Japanese invaders in 1937. But the documentary film, The Girl and the Picture, directed by Academy Award-winning documentary filmmaker Vanessa Roth and presented by the USC Shoah Foundation, brings memories of a survivor vividly to life for audiences in Orange County at the Newport Beach Film Festival, which ended on Thursday.

At the age of eight, Xia and her younger 4-year-old sister, witnessed the murder of their parents, grandparents and the raping and killing of their elder sisters along with their youngest, one-year-old sister by Japanese soldiers in the horror that would become known to the world as the Nanjing Massacre. Xia barely escaped with her life after she was gutted three times by the bayonet of a Japanese soldier and left for dead.

In the days that followed, John Magee, an American missionary outraged by the brutal treatment of the Chinese by the Japanese occupation, decided to document the atrocities to ensure there was evidence of the carnage. In the process, he filmed the young survivors, Xia and her sister, standing in front of the ruins of their family home, and so bound his family and theirs together forever.

In total, more than 300,000 Chinese people were killed by Japanese invaders during the brutal holocaust lasting six weeks in 1937.

"The Girl and the Picture is about bearing witness. It's about giving voice to the human experience and it is about storytelling so that the past is not forgotten," said Roth in a statement released by the USC Shoah Foundation.

The foundation was founded by Steven Spielberg, one of Hollywood's most popular directors and producers, with a mission to record eyewitness testimonies of the Holocaust and other genocides for research and education. Its intention is to prevent future atrocities by "never forgetting" those that marred human history in the past.

"The Girl and the Picture focuses on the story and voice of one of the last remaining survivors of the Nanjing Massacre of 1937 -- which in and of itself is a gift to us, as generations and a world that know little to nothing of this massacre," Roth said.

"It is also a project that I saw as a chance to excavate forms of storytelling itself -- and look at different ways we preserve legacy and memory, and process loss and survival," she added.

The documentary premiered at the American Documentary Film Festival in Palm Springs, California on April 10, and was then screened at the Tribeca Film Festival in New York, and the Newport Beach Film Festival in California.

Roth has won a number of film awards for her work, including a 2008 Academy Award for Best Short Documentary for Freeheld as producer. She is also the director of a Netflix Original documentary series "Daughters of Destiny," released last year.

"We want to bring this story out and preserve history and expose more to the world, so that we can learn from history and not repeat history," Livio Sanchez, the film editor of the documentary, told Xinhua in an exclusive interview during the Newport Beach Film Festival.

"Here in the West, we don't study that part of history very much," said Sanchez, adding that he knew a little about the Nanjing Massacre when the director came to him with the project.

"So I did my research and learned about the Nanjing Massacre and about Xia Shuqin. We want to tell her story in a very personal way that anyone in the world can relate to," he said.

Sanchez is an award-winning editor with an extensive and diverse body of work including independent films, documentaries, music videos, commercials and virtual reality immersive experiences.