Which three astronauts set a grim precedent by being the first to die in space?

Not all firsts are cheery. One of the worst firsts in space involved the 1971 deaths of three Soviet cosmonauts, Georgi Dobrovolsky, Vladislav Volkov, and Viktor Patsayev. They asphyxiated within seconds when a punctured breathing valve resulted in a severe drop in pressure within their spacecraft.

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