Developing the materials to make something nuclear would be just as obvious as using any nuclear device.
The energy signature created would be so big that any major world power would have you on their radar long before you could complete the project.
I’d even guess that finding the materials to make something nuclear would be a feat in itself. I doubt any normal person could get their hands on a nuclear core or uranium easily.
Also worth mentioning would be the extreme danger someone would have to go through and risk in order to assemble and build a nuclear weapon.
Also, there are satellites that can easily detect the signature of nuclear devices as long as they are not underground.
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