Daniel Craig performed many of his own stunts, including the signature rooftop fight on the top of a moving train travelling at fifty kilometers per hour (thirty-one miles per hour) during the opening sequence. Producer Barbara Broccoli has said: “Daniel contributes a great deal to designing the action and the fights in particular, and he’s the one who really pulls it off, because he wants to do as much of it as he possibly can. We were in Turkey for the train sequence, and I had my heart in my mouth the whole time. He and Ola (Rapace) were fighting on the roof of a moving train, and the moves that they were doing were just heart stopping. Daniel’s the reason why the action works as well as it does, because he sells it, he’s up there, and I think audiences know that.”