The Atlantic Avenue Tunnel is an abandoned railway tunnel beneath Atlantic Avenue in Brooklyn. The tunnel, which opened for use in 1844, connected the Long Island Railroad with South Ferry and took people back and forth between Brooklyn and Manhattan. Train cars were hauled by horses through the tunnel. In 1861, the tunnel was sealed off and faded from public view. It was re-discovered in the 1980s and then re-opened around 2009 and 2010.