Soyuz 21: The Secret Soviet Space Mission That Nearly Ended in Disaster

On July 6, 1976, the Soviet spacecraft Soyuz 21 lifted off from the Baikonur Cosmodrome carrying commander Boris Volynov and flight engineer Vitaly Zholobov. Officially, the crew was embarking on a 60-day mission aboard the Salyut 5 orbital station. Behind the public narrative, however, the station was part of the Soviet Union's highly classified Almaz military space program, designed to combine human spaceflight with military reconnaissance. By the mid-1970s, the Soviet space program was no longer focused solely on setting records. Orbit had become an arena for strategic competition, where scientific research, military observation, and national security increasingly overlapped. Soyuz 21 was expected to prove that long-duration military missions in space were practical. Instead, it exposed the enormous physical and psychological challenges of living and working in orbit. A Crew Years in the Making Both members of the crew had waited years for the opportunity to fly. Boris Volynov, one of the original cosmonauts selected alongside Yuri Gagarin, had endured repeated mission cancellations and survived a harrowing landing during his first spaceflight in 1969. Vitaly Zholobov had spent 13 years in the cosmonaut corps without ever reaching space.