The author surveys the long history of proposals to connect England and France by a fixed underground link, opening with a description of the Channel's surprising shallowness and the hazardous ferry crossing. He recounts nineteenth- and twentieth-century engineering plans—bridges, immersed tubes, and rail tunnels—along with detailed geological, hydrographic, and design studies. The narrative traces promoters' enthusiasm, political debates, and evolving technical assessments, and explains why practical feasibility repeatedly collided with cultural, economic, and political resistance in Britain. The book combines technical explanation, social history, and reportage to show how engineering plans intersected with national identity and policymaking.