Yes, I guess the question sort of ignores the von Daniken type stuff.....but if there were extraterrestrials here way back then (and I certainly believe they might have been), any nuclear detonations would not have been produced by earthlings. Nonetheless, the detonations above groubd during WWII and later would surely be a signal to anyone out there capable of noticing it that we had discovered certain elements and some processes of interest to them as well as us.It seems reasonably notable that all the UFO fuss in the modern world began after our first detonations.
It sure seems to. On some television program about UFO's there was a report about a UFO outside a guardhouse on a base. Before it left all of their underground missils had been deactivated. I hope they were some of the "good guys" and deactivated our enemies as well.