In 1929, he wrote and directed Frau im Mond (Woman in the Moon). The most expensive silent film ever made at the time, it is often called ‘the first serious science fiction movie.’ It told the story of a doomed voyage to the Moon; rocket pioneer Hermann Oberth was an advisor on the film. One of Lang’s creations in Frau im Mond was the first use of a ten second-countdown prior to a rocket launch. The use of a multistage rocket in the story influenced the development of rocketry in the real world.