they arent much use anyway, they are a very dissapointing spectical
I built up a Nuclear arsenal and used it, I had more Nukes than my enemies had cities, they had No SDI, and did not counter Nuke me.
still, each of my Nukes seemed only to remove 10% of the cities populations, and killed off no military units in those cities at all.
the only use is to destroy tile improvements.
bomb shelters need to be Nerfed big time before I will ever use a Nuke again.