The Royal Australian Navy Heritage Centre was opened in 2005 and is the official museum of the Royal Australian Navy. It is located in the Public Access Precinct of Garden Island: a section at the northern end of the island opened in 2002 that includes several heritage buildings and structures, historical relics, and naval monuments. The museum's exhibits include the conning tower from one of the Japanese midget submarines that attacked Sydney Harbour in 1942. The heritage precinct is isolated from the mainland by the naval and dockyard facilities, with public access limited to the Sydney Ferries service between Circular Quay and Double Bay, with the Garden Island ferry wharf at the north end of the island. Private pre-booked bus groups are allowed to transit through the naval base and dockyard to the heritage precinct under strict conditions.