Hey there, those channels you like sound awfully interesting to me as well. Would you mind sharing where you saw this bunker exploration video exactly?
Thank you :)
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For Soviet-era bunkers and similar urbex I suggest you have a look at Shiey (https://www.youtube.com/channel/UCpXwMqnXfJzazKS5fJ8nrVw/vid...) as well as Urbex Polska's videos on "Sobieskiego 100" (https://www.youtube.com/user/NaszaRzeczywistosc/videos).
I think this the channel that I was last watching: