6/30/1971 : The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve

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Soyuz 11 ends in disaster

Soyuz 11  was the only manned mission to board the world's first space station,  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 depressurised 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.