A report produced by Société Generale D'Expoitations Industrielles (SOGEI), Sir William Halcrow and Partners, Messrs Livesey and Henderson and Messrs Rendel, Palmer and Tritton for the Channel Tunnel Study Group relating to the engineering aspects of a rail or road tunnel under the English Channel. The report is divided into sections relating to general considerations for a tunnel, the aspects specifically relating to a rail tunnel and a consideration of an alternative road tunnel. There are also attached plans of the Channel and proposed tunnel schemes.