>should you really be disclosing how bunker ventilation operates, and the additional protection mechanisms etc. No problem, even civil bunkers works like that,

>should you really be disclosing how bunker ventilation operates, and the additional protection mechanisms etc. No problem, even civil bunkers works like that, you can make tours and even buy some. However there are some bunkers which are used as "control-centers" and those locations are kind of ~secret, but then again i'm really sure that Russia and the US already know much more about them as i do. That's a typical over-pressure vent (seen from the inside): http://www.bochumer-bunker.de/Spellna2.jpg http://www.bochumer-bunker.de/Spellna2.jpg And a filter-system for civil use (with hand-crank in case of power-outage): https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Filteranlage_Luftschutz.JPG/220px-Filteranlage_Luftschutz.JPG https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Fi... And one for big Bunkers/Fortresses: http://www.vorbei-ev.de/wwwa/wp-content/uploads/2017/10/bunker_gsvbw_image2017-09_15-768x576.jpg http://www.vorbei-ev.de/wwwa/wp-content/uploads/2017/10/bunk... Hint for recruits/active military: In military bunkers the outlets are also very important so that the "enemy" cannot smell your kitchen or see the warm air (infrared), which makes it a excellent place to smoke some green stuff ;)