Well, I still think that the requirement of one of these would negate wanting to live on the planet that needed it...

Your utilities are prepaid. Not "free" because this costs a ton of money. You don't have to get up for a tornado!

This might be the epitaph of so many architects with brilliant concepts and questionable execution: "it would work out the finer details of how all the autonomous and life-support technology would function with the help of specialists if commissioned." True for so many conventional buildings as well: renderings first, usability real soon now.

Really interesting thought exercise, but not sure i'd want to be stuck in a bunker that is so beige and monochrome, I think the interior design would have a detrimental effect on the family's mental health. Bright airy colours with plenty of artificial and natural light would definitely be high on my wish list.

This is a concept for living as old as mankind itself. "Earth Shelters" were the first form of human habitation.

The modern movement for self sufficient underground living gained a wider acceptance and following in the 1970's.

You can still find many imaginative designs featured in old copies of Earth Shelter Digest, New Shelter and Mother Earth News magazines.

Just dust off an old idea and give it a new name for a new audience.

Just what would these inhabitants be trying to escape from? Political instability? Not. Nuclear war? Might get you through it. Climate Change? Not.
The big catch is how long your food will last. Most food has a shelf life of one to five years. You really want to overcome these obstacles? Fix the world before it gets to that point.

Let's hear more about those architects who are truly looking out for humanity in general and less for the champions of the rich and clueless.

During my time in the military, I had nuclear attack/survival training, and it was demonstrated that reinforced concrete was not good at withstanding blasts. Sandbags were infinitely better, and far cheaper.
Also, in the event of a nuclear attack, a highly sophisticated, filtered, ventilation system is an absolute requirement, to prevent radioactive particles entering the dwelling. Otherwise one might just as well stand outside, and take deep breaths.
As for an indoor greenhouse; Its been shown that about 1/4 acre is the minimum to grow enough food for a family, (A lot of Victorian properties in the UK had 1/4 acre plots for that purpose, in the days before supermarkets.) It also requires intensive 7 day a week trained attention, plus farm animals to provide non vegetable nutrition, and fertiliser for the land. For, ''two or three families'' the area required would need to be proportionately larger, and even with multilayer, vertical cultivation, would still need a considerable area, and the power generation to provide strong artificial sunlight for maximum growth.
In addition, prevention of break-ins by starving, armed, gangs would be essential. Non is mentioned.
Conclusion, this bunker is just another ''Architects armchair fantasy''!

I'll be one of surviors, waiting for the people responsible for the catastrophe to emerge from their expensive, luxury hidey-holes to mete out some serious revenge.

"two or three families with children and staff with their families,"

I've never been clear on what's going to maintain that social hierarchy. How long until the staff is sleeping in the luxurious master bedrooms and relaxing in the media room, and the two or three families are cleaning toilets, cooking, harvesting plants, etc? Feudalism can't survive living in such close quarters.