Background
A spacecraft of the design Vostok 3KA had only been launched once before, which was on March 9, 1961. This mission was called Korabl-Sputnik 4, and it was a complete success. Prior to Korabl-Sputnik 4, the two previous missions in the Vostok programme were both launched in December 1960, and both ended in failure.
Only days before the launch of Korabl-Sputnik 5, the cosmonaut team, which consisted of 20 men, experienced its first fatality. Cosmonaut candidate Valentin Bondarenko was killed in a fire during a training exercise in an oxygen-rich isolation chamber. It's not clear whether other cosmonauts were told of his death or not; the media didn't learn of Bondarenko's death - or even of his existence - until many years later, in 1986.
Read more about this topic: Korabl-Sputnik 5
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