Stories like these will forever remind me of Hisashi Ouchi who died horribly from a different kind of criticality incident in Japan in 1999 [0]. He had received 17 sieverts and they tried to keep him alive for as long as possible in a human experminet. I won't post links to articles about this as you can't unsee pictures like that, putting his name in a search engine will get you there.

[0] https://www.japantimes.co.jp/news/1999/12/22/national/jco-wo...