Cinematographer Boyd Estus describes how he created the underwater scenes in the film, including shots of Eads' diving bell descending to the bottom of the Mississippi.
A railway to carry ships across Mexico? Find out more about the audacious plan Eads promoted to connect Atlantic and Pacific in the days before the Panama Canal was built.
Carnegie spent a large portion of his wealth setting up more than 2,500 public libraries and supporting universities and colleges, his main philanthropic priorities. By the time of his death in 1919, the handloom weaver's son had given away $350 million.
