Can’t find it now, but there was a reddit post where someone had shared a pic of a small DIY nuclear shelter for a family. Someone dissected why it was such an awful design, from the poor design for airflow, heat dissipation problems, inadequate walls to block radiation… there was a lot wrong with the design that you’d have to decide between dying of suffocation or just opening the door and getting some radiation.

A modern bunker would have to be relatively big, have all kinds of well thought out airflow systems that you could change a filter in without contaminating the “safe” area, and power to run it all for probably months at least. But now you’re the one person who is in good shape in a wasteland where easily a massive percentage of the population has died of lack of resources, medication. The people that kept everything running and repaired are among the dead, and probably the global supply chain has fallen apart. So congratulations…your bunker has saved you for a really shitty existence.