To ensure rapid progress, the film had three directors, and was shot simultaneously in various locations. Michael Powell was assigned the task of recreating the RAF bomber raids, and his taut and well-structured section stands up the best, while Brian Desmond Hurst's sequences include Merle Oberon and Ralph Richardson which brought 'the undoubted stardust he managed to sprinkle with the help of his leading actors' which helped fill the cinemas. Adrian Brunel, the last of the three credited directors, was responsible for the spy and 'crisis' scenes. Powell later remarked that the project was 'all shop-made, edited, and directed in less than a month'.