Multiple Cosmonauts aboard Voskhod
Credit: NASA

 
While not the first manned spacecraft to fly, the former Soviet Union's Voskhod spacecraft - a modified version of its one-man Vostok vehicle - was the first to fly a three-person crew. Voskhod 1 launched Oct. 12, 1964. The first spacewalk was later staged from a Voskhod vehicle.
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