I'd have bet this was a test site for such a project. Which given the name of the installation might be the goal. If anyone remembers the paper in question, my algolia-fu is failing me.
> The plan calls for huge 25ft (7.6m) tall granite columns marking the four-sq-mile (10 sq km) outer boundary of the entire site. Inside this perimeter, there is an earth berm 33ft (10m) tall and 100ft (30m) wide marking the repository’s actual footprint. Then inside the berm will be another square of granite columns.
— https://www.bbc.com/future/article/20200731-how-to-build-a-n...
― Thief Of Time, Terry Pratchett
https://en.m.wikipedia.org/wiki/Long-term_nuclear_waste_warn...
Better to make it highly deadly or entirely hidden (with the warnings to be uncovered if you start excavating).
The only exception is the one from Emil Kowalski. That proposal would make it so difficult to excavate the site that the civilization performing the excavation would likely have radiation detectors.
Step one in that is probably burying it sufficiently deep that it can't be found without advanced seismology.
A very interesting topic is that they hope that the repo is forgotten, nobody will remember about it and nobody will go looking for it or become curious about it and what's inside of it, as it is described "a place we have to remember to forget".
https://www.google.com/maps/@26.5978301,-78.6086813,2987m/da...
This one is 50 years old now too.
Development of a small yachting community was underway full steam in the early 1970's when The Bahamas gained independence from the UK, after that those not born there were no longer allowed to own property, only able to lease it for a period of 99 years at most.
So never mind.