The Green St. Bunker, West End (Townsville) is also known as the Sidney St. bunker and Project 81. It was built by the Royal Australian Air Force during World War II. The erection of the Green Street Bunker (Project 81) at the end of Sidney Street in West End was approved on 12 March 1942. The road up Castle Hill was closed to traffic on about 12 March 1942 to ensure the construction of military facilities such as this bunker were not obvious. The bunker was completed about 12 weeks later. The bunker was fully air-conditioned during its use in World War II.
