Nuclear technology barriers are more technological than informational. Finding information on how simple nuclear device works wouldn't be that hard I think. Actually creating a device that would work is another matter.
But here nobody actually knows even the ideas behind this - how exactly this thing works. Which sometimes happens too - e.g. see history here about lithium batteries, which was just recently discovered how they work even though they were in use for years. But there nobody knew that, there wasn't some inventor that hides it.
But here nobody actually knows even the ideas behind this - how exactly this thing works. Which sometimes happens too - e.g. see history here about lithium batteries, which was just recently discovered how they work even though they were in use for years. But there nobody knew that, there wasn't some inventor that hides it.