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 ...
theguardian.com
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
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These are basically small concrete boxes sunk into the ground. They're only meant to stick out a bushfire for a few hours.
You could probably just keep a few bottles of oxygen or a carbon dioxide scrubber stashed in there, just in case. If you can spend $10,000 on one of these bunkers, spending a few hundred more isn't going to make a difference.
Anything longer than a few hours would get dicey anyway without room to move around, without room to stash water or food, without a toilet or beds.
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
Water I get, especially if it gets warm, but the rest sound weird. It won't be comfortable to be sitting around for extended amount of time with your stomach grumbling but surely you can manage more than a few hours?