To the north american peeps on ERA who are willing to learn about it and have time to spare - there's a 4+ hour documentary trilogy called "La Batalla de Chile" (The Battle of Chile) by Chilean filmmaker Patricio Guzmán, that chronicles the period leading up to the coup and the events of the coup itself. Filmed back in 1972 and 1973, black and white. Not released in Chile until 1997.
It's on youtube. English subtitles. Dunno if it's geo-locked, though, you could try and see if you can watch it without issues.
Part 1
Part 2
Part 3
It's a time sink, yes. But it's eye-opening if you literally don't know anything about it. You'll see testimonies from people back then, common folk and politicians. It's harrowing as fuck, but also invaluable.