Soyuz 11 (Russian: Союз 11, Union 11) was the only manned mission to board the world’s first space station, Salyut 1 (Soyuz 10 had soft-docked but had not been able to enter due to latching problems). The mission arrived at the space station on 7 June 1971 and departed on 30 June. The mission ended in disaster when the crew capsule depressurized during preparations for reentry, killing the three-man crew. The Soyuz 11 crew members were Georgy Dobrovolsky, Vladislav Volkov, and Viktor Patsayev.
The three crew members of Soyuz 11 are the only humans known to have died in space.