That's kind of the point I was getting at witch doctor. I don't like the idea of umbrella in the story. Raydon could have been working on an anti cancer type treatment and accidentally unleashed z day with whatever gas is coming out at GZ.

I hang my hat on many theories. I'm currently a fan of this one and I'll stick to it until Kc proves me wrong or a better theory woos me away. I'm fickle like that.