The movie will premiere at Wollongong Town Hall on March 21, after filming of the final re-enactment scenes last month.

The documentary's director and producer Sandra Pires said the project had been a true labour of love, spanning four years and several continents.

"We travelled to China to interview survivors of the 1937 Nanjing Massacre, which was quite horrendous, their stories were just so sad," she said.

"You have no idea how happy I am to have completed the project; I didn't think we'd get there at one stage, I had all these production costs and nowhere to go for funds but it was definitely worth it."

The documentary, which was partially filmed in the Illawarra, focuses on a group of Port Kembla wharfies who refused to load pig iron headed for Japan, amid fears it would be turned into weapons for its war against China.

The move sparked a nine-week stand-off with the Australian government and prevented Japanese bombs being made from Australian pig iron.

Film crews interviewed Robert Menzies' daughter Heather Henderson about her father's visit to the port, along with former deputy Labor leader Tom Uren, who was a prisoner of the Japanese.

Ms Pires said the filmmakers were lucky to capture his thoughts just months before his death on January 26.

"His message was one of amity, he didn't hate the Japanese people any more," she said.

"This is a documentary about peace, that's the overarching theme of it.

"These guys fought at a great personal cost ... they saw their kids go hungry; it's a huge story, bigger than Eureka, and people across Australia should know our history."

The film will be screened in all Australian capital cities and launches in China in September.

Copies of the film will be available for sale at the Wollongong launch.

Tickets for the launch are available here.