There is also a large bell in one of the tunnels. According to one source, the ABC used this bell to simulate the sound of Big Ben for use in a TV series during the 1960s, but that information has not been verified. Another source suggests that the bell was installed by Nigel Helyer in 1992 as a work of art. The piece, titled "An UnRequited Place", was part of the Working in Public project created by ArtSpace Sydney, and was a combination of the physical sculpture, performance and audio broadcast. For 21 days the sound of the bell tolling at midnight was broadcast by the ABC.