The tunnel was built through the chalk of Southwick Hill using the New Austrian Tunnelling method.
University of North Carolina at Chapel Hill | Chapel Hill, North Carolina | One Tree Hill | One Tree Hill (TV series) | King of the Hill | Chapel Hill | Hill Street Blues | Parliament Hill | Capitol Hill | Notting Hill | Channel Tunnel | Cypress Hill | Broken Hill | Mill Hill Missionaries | Faith Hill | Harry Hill | Broken Hill, New South Wales | Grange Hill | Lauryn Hill | Benny Hill | tunnel | Castle Hill | Anita Hill | Castle Hill, New South Wales | Blythswood Hill | Swan Hill | Rowland Hill | Chestnut Hill, Massachusetts | Cherry Hill, New Jersey | The Benny Hill Show |