Queue Chernobyl documentary clip measuring the radiation as low because that’s as high the meter went
Though I suppose you could also queue it.
It’s also technically not a documentary but historical drama.
Casting (who played who), acting, costumes and scenography (where did they get all these '80 soviet cars), and choice of scenes to film.
I had my hair rising when the guy cleaning roof of a building neighboring the reactor got stuck in deadly radiation zone for 4x the allowed 13 seconds. "You're dead comrade."