Escaping underground: the eerie new age of bushfire bunkers — With concrete walls, flame-proof doors and wine racks, bushfire bunkers offer the promise of safety, at least for those who can afford …::With concrete walls, flame-proof doors and wine racks, bushfire bunkers offer the promise of safety - at least for those who can afford them
They could put in a bunch of high-O2 producing plants like mother-in-law’s tongue and be relatively okay-ish.
is a bunch of plants in a small bunker sufficient for making enough o2?
No
No, you need 7-8 full-grown trees to offset a single person’s respiration. https://www.sciencefocus.com/planet-earth/how-many-trees-does-it-take-to-produce-oxygen-for-one-person