Construction of the second, Moskovsko-Petrogradskaya line began almost immediately after the initial opening of the metro. Just six years later, in 1961, the section from Tekhnologichesky Institut to Park Pobedy, along Moskovsky Prospect to the southern areas of the city, was opened. In 1963 the line was extended north to the station Petrogradskaya station; in the process making Tekhnologichesky Institut the USSR's first cross-platform interchange station. Further extension of the line was undertaken to the south in the early 1970s, and in the 1980s to the north, with the final station Parnas being opened, following numerous delays, in 2006.