Now with SSVP(ska blt)

Soyuz 7K-OKS

part of Salyut programme

DOS-1

On April 19, 1971, the Soviet Union placed into orbit Salyut, the world’s first space station. Designed for a 6-month on orbit operational lifetime, Salyut hosted the crew of Georgi T. Dobrovolski, Vladislav N. Volkov, and Viktor I. Patsayev for a then record-setting 24-day mission. The flight ended tragically when the crew died due to the sudden depressurization of their Soyuz 11 spacecraft shortly before reentry into the Earth’s atmosphere. Over the succeeding decades, Soviet, and later Russian, engineers continually improved on the original Salyut design, launching ever more capable generations of space stations in the Salyut series and the Mir station’s Base Block.

DOS-2

DOS-2 designation given to a space station, launched as part of the Salyut programme, which was lost in a launch failure on 29 July 1972, when the failure of the second stage of its Proton-K launch vehicle prevented the station from achieving orbit. It instead fell into the Pacific Ocean. The station, which would have been given the designation Salyut 2 had it reached orbit, was structurally identical to Salyut 1, as it had been assembled as a backup unit for that station.