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And here's one with the door still on the compartment: https://commons.wikimedia.org/wiki/File:Decommissioned_Soviet_Missile_Base_near_Pervomaysk_Ukraine_(16359023982).jpg … Unfortunately I'm not finding many photos of the whole panel that are readable. The thing at the far left looks like an unlock key of some sort.
(I mean far right.) Anyway — an interesting question I hadn't thought about before.
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