Last night I watched a video about a visit to Perm36 but it covered just the trip. The video below is far more complete and informative. I am currently reading Gulag by Anne Applebaum, rather than The Gulag Archipelago, like she mentions. I started reading it decades ago but never finished it. I read A day in the Life of Ivan Denisovitch in a single day.
Reading Gulag, The Gulag Archipelago and other books helps give some context to what Soviet Russia was like. As I read Gulag by Applebaum I get the feeling that Soviet Russia was about enslaving people to make profit for some whilst everyone else suffers. From this perspective what the Soviet Union would morph into, at the end of the Soviet age would make more sense.
I recommend watching this video. It is informative.