The Making of the Channel Tunnel | 1999
Although many aspects of the construction of the Channel Tunnel are "high-tech," tunneling is a dirty and unglamorous business. Since Roman times, Europe's leaders have dreamed of a tunnel linking England and France. Sometimes the motivations were commercial, but for others, like Napoleon, the considerations were more of a geo-political nature. There are three tunnels, each specifically designed to leak and relieve water pressure on the lining. One runs from France to England, another runs the opposite way and the last is in the middle and allows access to the train tunnels for maintenance.