Yeah that's an interesting video. Seeing videos from the Atols, and how ridiculously large the explosion is compared to the ships, cruisers, etc. is frightening.
I remember having a dream (nightmare really) shortly after 9/11, about watching the Fireworks at Summerfest in Milwaukee from way out on a boat in Lake Michigan. Then BAM, mushroom cloud engulfs the whole downtown area...and I actually, physically had the worst, most sunken feeling in my stomach I've ever had in my life. I "slammed awake" in a cold sweat, still with that sunken feeling. I couldn't sleep the rest of that entire night.
...funny how the mere concept of something like this can affect a person so much. Nuclear war....yeah, that's one of the very few things I might have a nightmare about.