On March 18, 1965, 30-year-old Russian cosmonaut Alexey Leonov completed a 12-minute spacewalk. He wore a specially designed space suit which was tethered to the capsule.
As he ventured from the Voskhod 2 space capsule, Leonov's suit expanded as the pressure around him changed. Having spent ten minutes in space, his suit was blowing up like a balloon. If he didn't act, the suit would start coming apart. He vented precious air inside the suit into space and as the effects of decompression sickness and the heat from the exertion began to take their toll, pulled himself back onboard the craft.
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