Principal photography began in Lithuania on 13 May 2014.[3]Krista Kosonen who plays female lead, Helena, cut her hair on camera for the role.[4] She also learned Finnish dialect from Katja Kettu's novel. Many cast members change their physical appearances; Tommi Korpela lost 44 pounds for his role as a SS officer; Elina Knihtilä lost 22 pounds for her character Heta, prisoner of war.[5][6] On 10 April 2015 Jokinen informed in an interview that the production of the film was finished and that the film was complete.[7]