Glad you are ok Sarapuk.
You can find it. Be an on line detective. The SAM base was northeast of Sverdlovsk. The train to IVDEL ran through it. The Powers incident was the first time that the Soviet Union stopped the overflight espionage of U2 plane. Always in murder, first question - WHY? If it is worth risking thermonuclear obliteration, isn't it then a sufficient reason for murder?
Why, murder? Wild Menk, drunk Manzi, rogue MGB? Really? To kill little Princes of Technology of new SSSR? To kill graduates of the premier technical college during a nuclear Cold War? Who dares? But if it is related to espionage on S300 SAM - yes, their lives are not worth that.
I still am silent about the Nine out of respect. They deserve the respect they have not been granted.
At this point I wouldn't be surprised if people are being experimented on by a group of countries working in conjunction with each other, including my own country.
Because of the information you discovered about the the "three heads" picture I'm very skeptical that any of the alleged pictures presented by Valentin Yakimenko are actually from the camera on Zolotaryov's body.
Looking through the other rolls of film, there are lots of spots and defects that could, when magnified, look exactly like the pictures Yakimenko presented.