The film's wingsuit footage was shot over a period covering 6 months and at several locations each in France, Italy and Norway.
The scenes in the Stay Behind headquarters were shot in a former NATO operations room, underground at Holmenkollen Leir in Oslo.
Several of the props and costumes are based on original designs and sketches by writer/director Thomas Cappelen Malling. The fully functioning watch worn by actor Mads Ousdal in the movie was both designed and built by Cappelen Malling.