Super duper strong bombs exist but from the few hours of documentaries I watched on the whole Nuclear thing was propaganda to entice fear into Gen X making them hide under tables and cause unknown trauma to them. Similar fear-porn of COVID/masks.
If you stacked a bunch of TNT on top of one another and blew it up you'd still get that mushroom cloud.
If you watch all of those test explosion footage then you must ask yourself how the camera is still intact and recording while everything around it is getting obliterated.