Zwei interessante Links hinsichtl. des Versuchs 1880 einen Tunnel unter dem Kanal zu graben:
http://www.subbrit.org.uk/sb-sites/sites/c/channel_tunnel_1880_attempt/index.shtml
http://www.subbrit.org.uk/sb-sites/sites/c/channel_tunnel_1880_attempt/index1.shtml
http://www.subbrit.org.uk/sb-sites/sites/c/channel_tunnel_1880_attempt/index.shtml
http://www.subbrit.org.uk/sb-sites/sites/c/channel_tunnel_1880_attempt/index1.shtml