Soyuz T-1 was an uncrewed long-duration qualification flight of the upgraded Soyuz-T spacecraft. It launched from Baikonur Site 31/6 on December 16, 1979, docked with the unoccupied Salyut 6 station on December 19 after an overshoot on the previous day, and remained docked for 95 days. After undocking on March 23, 1980, the spacecraft conducted additional tests and landed safely in Kazakhstan on March 25.