Christopher Nolan was hesitant about returning to the series for a third film, but agreed after developing a story with his brother and Goyer that he felt would conclude the series on a satisfactory note. Nolan drew inspiration from Bane’s comic book debut in the 1993 “Knightfall” storyline, the 1986 series The Dark Knight Returns, and the 1999 storyline “No Man’s Land”. Filming took place from May to November 2011 in locations including Jodhpur, London, Nottingham, Glasgow, Los Angeles, New York City, Newark, and Pittsburgh. Nolan used IMAX 70 mm film cameras for much of the filming, including the first six minutes of the film, to optimize the quality of the picture. A vehicle variation of the Batplane and Batcopter termed the “Bat”, an underground prison set, and a new Batcave set were created specifically for the film. As with The Dark Knight, viral marketing campaigns began early during production. When filming concluded, Warner Bros. refocused its campaign: developing promotional websites, releasing the first six minutes of the film, screening theatrical trailers, and sending out information regarding the film’s plot.