Last night Bobbi and I finished watching The Spacewalker, a Russian film about the Voskhod 2 space flight, which was (as you might guess from the title) the first spacewalk. It was hairier than Soviet government propaganda admitted at the time, some real by-the-skin-of-their-teeth stuff.
I didn't realize, until Bobbi told me, that the Soviet capsule needed an extendible airlock (unlike the NASA Gemini capsule) because they couldn't vent the whole capsule to vacuum for the duration of the walk without the risk of tube-based electronics overheating.
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