Those who witnessed Castle Bravo looked into Armageddon
This was really when people started figuring out how bad fallout from thermonuclear bombs could be. General Fields described it most lucidly:"If Bravo had been detonated in Washington, D.C., instead of Bikini, Fields illustrated with a diagram, that lifetime dose in the Washington-Baltimore area would have been 5,000 roentgens; in Philadelphia, more than 1,000 roentgens; in New York City, more than 500, or enough to result in death for half the population if fully exposed to all the radiation delivered. This diagram was classified secret and received very little distribution beyond the Commissioners." [1]Image reproduced here [2].Thermonuclear bombs are really terrifying. If one goes off and you're in the fallout zone do not go outside for at least 2 weeks. If you survive the initial blast you have about 10 minutes to get inside where you must stay. If you're still outside and it's 'snowing' ash you're already dead. More tips and tricks in [3].Though these days, they say it's likely that a single individual or small group can have even worse impact from a basement bioterror lab.[1] Hewlett and Holl - Atoms for Peace and War around pg 181 (free pdf history book) https://www.energy.gov/management/downloads/hewlett-and-holl...[2] https://whatisnuclear.com/img/castle-bravo-if-on-dc.png[3] Nuclear War Survival Skills (free pdf book) https://www.oism.org/nwss/