It took five grueling years to build Titanic, and yet she sank in less than three hours. Among the 1,500 souls who perished were some of the men who actually helped build her - the so-called "guarantee group," who sailed to America as a reward for their labor. This extraordinary film, narrated by Charles Dance and featuring detailed CGI models, reveals the untold story of violence, determination and political drama behind the construction of Titanic.