1971: se lanza la Soyuz 11; la misión termina en desastre cuando los tres cosmonautas son asfixiados por una descompresión incontrolada de la cápsula

Soyuz 11 is launched. The mission ends in disaster when all three cosmonauts, Georgy Dobrovolsky, Vladislav Volkov, and Viktor Patsayev are suffocated by uncontrolled decompression of the capsule during re-entry on 29 June.

Soyuz 11 was the only crewed mission to board the world's first space station, Salyut 1. The crew – Georgy Dobrovolsky, Vladislav Volkov, and Viktor Patsayev – arrived at the space station on 7 June 1971, and departed on 29 June 1971. The mission ended in disaster when the crew capsule depressurised during preparations for re-entry, killing the three-person crew. The crew members of Soyuz 11 are the only humans to have died in space.