The third Nevsko-Vasileostrovskaya Line was first opened in 1967 and eventually linked Vasilievsky Island, the city centre, and the industrial zones on the southeastern bank of the Neva in a series of extensions (1970, 1979, 1981 and 1984). The fourth line, Pravoberezhnaya, was opened in 1985 to serve the new residential districts on the right bank of the Neva before reaching the city centre in 1991 and continuing to the northwest in the late 1990s. It was in this period that the opening of the metro's fifth (Frunzensko-Primorskaya) line was planned, however, it was only in 2008, with the opening of Volkovskaya and Zvenigorodskaya stations, that this took place. On 7 March 2009, when the fourth line was expanded with the addition of Spasskaya station, the fifth line finally (as dictated in earlier projects) began to directly serve both the Primorsky and Frunzensky districts of Saint Petersburg.