"It lasted just 12 minutes, but history's first-ever spacewalk – 50 years ago today – took the first steps towards shaping the future of space exploration.

On March 18, 1965 at 4:35 a.m. EDT (0835 GMT), Soviet-era cosmonaut Alexei Leonov became the first person to leave the confines of his spacecraft while in orbit and float in the vacuum of space. Leonov, who with Pavel Belyayev was flying onboard the former-Soviet Union's Voskhod 2, accomplished the first extra-vehicular activity – EVA, or spacewalk – on what was only the 14th piloted spaceflight in history.

Leonov's EVA did nothing more than demonstrate, barely, that such a feat was possible, but the future spacewalks it inspired — starting with the first American EVA by Edward White three months later — blazed the path for humans to walk on the moon, build and maintain space stations and service satellites and space telescopes (...) "

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An interactive 3D model of the Voskhod 2 spacecraft, with inflatable airlock deployed - https://en.wikipedia.org/wiki/Voskhod_2#/media/File:Voskhod_2_Deployed.stl