Could sewers in large cities like Chicago theoretically be converted into underground passageways to allow?

You have a debatable notion of "Warmth and comfort.

Yes, but of course the Chicago Machine is crooked so what would cost say 100 Billion dollars to build would end up costing a trillion after all the local officials got apiece of the pie.

Uhhhmmm ya if ppl crazy wild young ppl lyke me make a way.

" Also, why is it the only option. You seem to forget the option of letting people walk around outside like they have for thousands of years.

Chicago already has underground pedestrian tunnels throughout downtown. So do Dallas and many other major cities.

Toronto, Canada has an underground city. It was not made from the sewers. It is beautiful and goes for miles.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.