In the 2000s it was decided to complete the Mergellina station and to open the section that had already been built, but as a light metro without any connection with the tram network.
[5] The line was run by Metronapoli until November 2013, when the operation of the Naples Metro was taken over by Azienda Napoletana Mobilità SpA (ANM).
Initially, the closure resulted from a building collapse in 2013 that affected the tunnel, then continued during work to extend the underground line from Mergellina eastwards to Municipio.
[8][9][10][11] In 2009, an extension to Bagnoli was planned, with intermediate stops at Campegna, Acciaieria, Città della Scienza, and Porta del Parco.
[12] In 2022, a branch line was planned from the future Campegna station to the Posillipo neighborhood, with a stop in the caverns of Piazza San Luigi and an elevator connection to the overlying Via Francesco Petrarca.