The Chinese option for a Higgs factory is among the future collider projects being currently discussed by high-energy physicists. It is not clear yet this will be ever built, and if it will be built in China. CERN is an option too. Again, no data as this is not existing yet.
There is no accelerator project in Antartica to my knowledge (at least from a particle physics standpoint). In contrast, several neutrino/dark matter experiments are relevant for this part of the world.
I can ensure you that safety measures have been taken so that for all the projects, there is no risk for the surrounding people. Shielding, etc... All of this has been studied, and all the studies are public (probably on the CERN website for the LHC, and I don't have direct links to share... I guess google can help if you want to have a look).
This being said, too much radiation would also damage the detectors which lie much closer to the beams than mister and miss everybody. I don't know if this will convince you that all of this is safe, but this may be a further starting point for discussing ;)
;)