Dummy mission 3 days before 1st spacewalk exploded in space
Only three days before the first-ever spacewalk, scheduled on March 18, 1965, a dummy mission with an empty spacesuit had exploded shortly after launch. However, in order to achieve the feat before the US, who had planned a spacewalk in June 1965, the Soviets continued with their original plan, where cosmonaut Alexey Leonov became the person to float in space.