Comment: After reading this article, now I know that none of those involved received any formal training nor have the required minimum experience.  After being with the U.S. Nuclear Program, I was a Instructor, Course Writer, Course Evaluator and finally a Branch Chief (Nuclear (Weapons) Physics and Physiology).  Common sense, sealing all windows and doors, nice suffocation is less painful.   Coming out hours after the Nuclear Detonation, get irradiated by almost talcum powder fine alpha and beta radiation particles, walking thru that will kick that up for you to breathe, most filters and respirators will clog quickly, carry that contamination back into your shelter.  For as long as there is anything to burn the Firestorms will rage for weeks, so sure open the door, flash fire (like a "Backdraft")  will burn you quickly as sucking the oxygen out of where ever you were killing everybody else.   Contradictions in the written advice from the State "Hawaii Emergency Management Agency".