In the autumn of 2010, Yang Buting , the former chairman of China Film Group, invited Feng Xiao to be the director of "Chongqing Air Strike; Unbreakable Spirit", but the film was not officially launched until 2015. In 2015, during the filming of the film, the employer stopped investing several times. The first time he stopped investing, Feng Xiao bought two ten-wheeled cards that needed to be paid as prop cars. When the main scene of Chaotianmen Wharf was built, the investor stopped investing again, making it impossible for hundreds of construction workers to start the construction. Feng Xiao used his years of savings to top it. Since February 2016, the crew has been without a cent. At the beginning of 2016, the box office fraud incident of "Ip Man 3" caused the Kuailu Group's dam to burst. Feng Xiao's creative team was unable to pay the arrears and urgently needed a lot of funds for post-production projects. In the stressful two years that followed, he went through a series of procedures such as financing loans, mortgage loans, liquidating stocks, redeeming investment funds, and depleting personal deposits. Until October 2017, all his personal disposable cash wealth was only left. 1516 RMB
.
In terms of visual effects, the entire film was shot in 3D, with as many as 2,300 special effects shots. Director Feng Xiao made a special trip to New Zealand for this and spent 11 months learning special effects. In addition, the technical staff of mixers, recording directors, and sound effects supervisors are all from international special effects teams. During the filming, the crew used 40,000 generator squibs, 2,500 kilograms of gunpowder and 2,000 liters of petrol bombs
.
The art team of "Air Strike; Unbreakable Spirit" conducted a large number of visits and researches during the early preparations, collected a large number of historical materials and photos, and used history as a prototype for design and processing. The work took more than 6 months, and several scenes were successively designed and produced, such as: Chaotianmen Wharf, teahouse, Chongqing Republic Street, airport hangar, ruins, church, air-raid shelter, etc., and most of the props used in the play were the team themselves. Design and production, including the I-15, I-16, P40, Zero fighter, 96 bomber, 96 carrier-based fighter used in the shooting. Moreover, the 1:1 restoration of Chaotianmen Wharf in the film, even a small shop has historical basis; the slogans written by the masses, the fonts are strictly in accordance with the historical materials; the scene of the tunnel tragedy is exactly the same as the sculpture in the Chongqing Museum ; The life scenes of the common people also overlap with the historical photos
.
