Sort:  

There is actually only a single LHC worldwide, and there is not any VLHC so far (although this is actively discussed by high-energy physicists). So that there is no answer to your question, I guess :)

I could have phrased the question more precisely however this is merely over-view and brief comment - and precision engineering notation wasn't my focus when considering nondisclosure agreements; so the sites with Superconducting Super Collider (SSC); sites with powerful magnetic field to confine plasma (such as the nearby I.T.E.R.); and other powerful field experiments is a unknown potential.

Sigh...

Aaaah ok now I got it. The SSC project was actually abandoned long ago (before my time) and there is thus no data there (for the reason there is just no experiment at all). Concerning ITER, we are handling nuclear fusion and are thus talking about different scales, purposes, etc...

The closest machines we can compare the LHC with are the Tevatron collider (close to Chicago and that was shut down few years ago) and the former CERN machine LEP. The data of these two experiments are consistent with the LHC. They were not capable to probe the anomalies I am mentioning here.

There were on the other hand experiments dedicated to flavor physics, like BaBar (Stanford) or Belle (in Japan) and the results are consistent with the LHC findings.

I hope this helps :)

You didn't list the Higgs Factory (China's supercollider, but they claim it will operational in 2020 and I heard about something in Antarctica)...
The many projects worldwide (regardless of stated purposes and operational status) could have undesired consequences - consider this simple example: wife turns on kitchen's blender and down the hall three rooms over the TV news is scrambled.

With the shieldings and underground locations I don't expect these massive projects to be interfered with, but what about the potential affects on nearby energy fields that make up the ambient environment and life?

I imagine this is a mute question with your colleagues, discussions about unintended consequences are dismissed with assurances of the many precautions, but with so many worldwide projects not communicating to each other as a safety precaution (to protect human, farms, ambient enviro) this is added complexity with potential hazards.

Consider my comment a cautionary reminder - discuss right and wrong, and ask for other projects' "undisclosed" operations at least for safety concerns.

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 ;)