the interior of underground anti-nuclear abandoned secret military bunker. creepy place, post-apocalyptic background

abandoned anti antinuclear apocalyptic archive army background base bomb building bunker catacomb center chernobyl classified communications construction creepy declassified deep destroyed digger dungeon empty extreme history interior metal military moldova nuclear object place post postapocalyptic pripyat radoaya radoya rest rusty secret shelter soviet tunnel ukraine underground urban ussr war welcome