The Grange Subway, one of twelve infantry communication tunnels prepared prior to the assault on Vimy Ridge in April 1917. Constructed by 172 Tunnelling Company, the subway was 6ft 6in high by 3ft 6in wide, enough for two men in full equipment to pass, 1,343yds long with 25ft of head cover. It was used by Princess Patricia’s Canadian Light Infantry to reach their jumping off trenches before zero on 9 April 1917 and also housed mortar emplacements, headquarters dugouts and a dressing station. It is seen here after restoration for opening to the public in 1936, when obscene graffiti was removed, and it remains open to the public today. (Author).