 Even in the wake of major companies' refusal to support the project, Madsen and Andersen continued to research archives in England, Germany and Sweden. In 2005, however, German films about World War II started to become popular, and several German companies became interested in the idea for the film. It became a co-production between Denmark and Germany, with three companies — Nimbus Film, Wüste Film and Babelsberg Studio — producing it. Filming took place at the Babelsberg locations in Potsdam-Babelsberg, Germany, and large parts of the film were shot at locations in Copenhagen, Denmark, and Prague, Czech Republic. It received a $ 460,000 grant from the German Film Fund for its total budget of more than 45 million Danish kroner (or $ 7.6 million), making it the most expensive Danish film produced to that date.
