I think if it had turned out differently, and it had been possible to make an H-Bomb that produced no fallout, they would have continued to scale up.

There were lots of plans for using nukes for large-scale engineering projects.

- Make a protected harbor from a straight coastline

- Get that mountain that's in the way of your railroad flattened

- Add a freshwater lake to this plain

- Mine an entire vein at once

Reality got in the way and we found out that we don't want to be doing that.

Maybe if we get practical antimatter bombs we'll revisit those plans.