1st-ever spacewalk in human history nearly ended in accident

On March 18, 1965, Soviet cosmonaut Alexey Leonov performed the first spacewalk in history. Leonov exited his spacecraft through a cylindrical airlock after which his spacesuit inflated due to internal pressure against the vacuum of space, making it difficult to re-enter. He then broke protocol, depressurised the suit off oxygen and successfully entered the module, ending the 12-minute spacewalk.