 Complete the following phrase:  Construction of a metro system in Kharkiv became evident in 1967, when the Soviet Council of Ministers approved the construction of the systems first line, then referred to as the SverdlovskoZavodska line . Subsequently, construction on the line began on July 15, 1968 near where the Pivdennyi Vokzal station is located. On August 23, 1968, a date symbolic of the 25th anniversary of the 