Steve
Steve asked Nicholas Sansbury Smith:

I'm reading the second book in the Hell Divers trilogy. I'm wondering what caused the apocalypse? Were the airships manufactured by ITC used to bomb the US?

Nicholas Sansbury Smith Hi Steve, The answer to your question is explained in book 1 and more in book 2. Essentially the very airships now housing humanity were the same ones used to destroy the surface. ITC was the manufacturer, but I don't go into detail about the governments involved or what caused the war at this point.

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