On March 18, 1965, history was made as the Soviet spacecraft Voskhod-2 lifted off from Baikonur with Alexei Leonov and Pavel Belyayev aboard. Tasked with humanity’s first-ever spacewalk, the mission carried enormous scientific, personal, and geopolitical stakes. Amid the intense space race of the Cold War, every moment outside the spacecraft was uncharted territory, fraught with danger.