Planning for the Tashkent Metro started in 1968, two years after a major earthquake struck the city in 1966. Construction on the first line began in 1972 and it opened on 6 November 1977 with nine stations. This line was extended in 1980, and the second line was added in 1984. The most recent line is the Circle (Halqa) Line, the first section of which opened in 2020.