First, scan the following abstract: https://arxiv.org/abs/astro-ph/9910192
This is probably the most ideal place on planet Earth for conducting a Hum hearing test. Entering the testing room underneath that much earth and electromagnetic shielding provides an excellent environment for eliminating several hum hypotheses.
Our project at http://www.thehum.info has achieved international recognition now, and if you feel able to write a serious letter on my behalf – especially if you have some scientific or medical training – then do so. Ask for permission for a group of volunteers to access the chamber. I’m sure the international media would be interested, which would provide a win-win situation for the group running the room as well as those of us working to solve the Hum.
I’ll mention again that organized effort is the only method of side-stepping the profit motive that drives most university and serious private labs. But it takes time and effort, and I can’t do it all by myself. I need your help in reaching out to people who can assist us.
World Hum Map and Database Project 
All I can say is perhaps one of the scientists working with this facility is going to wonder why it is, that despite all the insulation., they can still ‘hear’ this strange Hum like sound.
I’m not sure I fully understand your comment, but if the Hum is silenced in that facility, then that would be a very significant result. If the Hum is not silenced, and ELF radio can also be ruled out, then I think that’s an equally important result. But it’s like 20 other concepts I’ve suggested here – somebody has to actually go out and do it.
Yeah I didn’t express it very well.
What I meant was perhaps one of the scientists there is a Hum hearer. And if the shielding at this facility is ineffective against the Hum, then perhaps this one person would still hear the Hum inside the place. Which might lead them to ask – Why is there an apparent sound in here despite the fact that all this shielding is being used?. It’s a long shot, I know.
If the facility does actually block the Hum none of the above could happen of course.
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