I don’t know how that would ever be possible.
Problem is the same as the problem of military use - you usually wants the force distributed in a very specific way.
> Chinese scientists already have warned that further nuclear tests could cause the mountain to collapse and release the radiation from the blast.
It sounds like it's "tired" in the sense that the mountain itself is exhausted from too many underground tests, and additional tests may collapse it risking test-originating radioactive fallout.
Subterranean nuclear testing produced rock fatigue from the unusual stresses and strains.
It's one of the few geologically detectable effects of the anthropocene era, like increased atmospheric CO2, and the discontinuity in the baseline C-14/C-12 ratio. If human civilization were to be erased from Earth, a future researcher would still be able to determine that at some point, something dug up carbon fuels and burned them for power, and at a somewhat later point, something detonated nuclear weapons in the open atmosphere, and in underground tests.
Where as tired could imply performance degradation is already happening.
Obviously this isn't that precise, but it's my personal interpretation.
You might have thought that there was some giant underground complex, but it's really just mining equipment drilling a hole and a bunch of sensors strung out feeding data to recording devices that are a long way away.
Edit: to clarify, they don't reuse holes for repeat testing (that I'm aware of), they just drill a new one a few miles apart. So a "testing site" is just a bunch of land that the government owns and is willing to never use it for anything else.
Still! What does the container for a nuclear explosion look like on the inside? Is it smooth and glassy? Does molten material drip down and form stalactites and stalagmites? Does the surface crack as it cools? What color is everything?
Here's Project Gnome's: image https://en.wikipedia.org/wiki/Operation_Nougat#/media/File:P...
better color https://www.reddit.com/r/HistoryPorn/comments/1fgvt8/a_perma... video https://www.youtube.com/watch?v=DFJ2MyWlXgs&t=1442
report with diagrams https://www.osti.gov/biblio/4612556 cross-section http://nuclearweaponarchive.org/Usa/Tests/GnomeDiag1024.gif