Auber (French pronunciation: [obɛːʁ]) is a station on Line A of the RER in Paris. Opened on 23 November 1971 it was at the time the largest underground station in the world, and represents a feat of underground engineering. The station comprises a main train hall with a superposed ticket hall, together with an extensive network of particularly spacious tunnels connecting to the neighbouring Métro stations Opéra, Havre-Caumartin and Saint-Lazare, as well as Haussmann - Saint-Lazare on the RER Line E. It takes its name from Rue Auber, under which it is situated. This street is in turn named after the 19th-century composer Daniel-François-Esprit Auber.