HH-drewan,
I know exactly the sound she is hearing. It is/was the Ultra Low Frequency (ULF) military communication system developed for our submariner service. The ULF transmitters are somehow imbedded in solid rock. Rock formations of a certain type. That transmit the humming throughout the world. Underwater. It's been around since at least 1972 when I loved in Boulder Colorado. It sounded like an diesel locomotive engine near the foothills. Everyone heard it and complained to the city whom dispatched crews to locate the train. Not a lot a train activity in Boulder and few tracks, so there weren't a lot of likely places to search. I relocated and read about the ULF military transmissions sometime later and connected the dots. That is what we were hearing.
Background on that is cold war thinking. Our sub fleet could destroy anything, anywhere as long as they got the proper coded go-to-war message. What if the surface radio, satellite or whatever communication links were down (as in Nuked) how would the sub drivers know what to do. And to whom.
So the ULF comm system was developed just for that purpose. The connection to Boulder Colorado and Hancock-Houghton is the Rocky Mountains. It is like a spine of the earth. A thousand plus mile solid rock seam that conducts those signals to many places located along the spine. So Taos is right there.
The difficulty of that form of communication is it requires a morse code type serial message code. Long, short and maybe amplitude modified. Bottom line is the military would have to encode the message, plus have some tricky authorization codes to verify a missile launch authority. I read that message could be ten or more minutes long but can be read underwater anywhere in the world. Pretty cool.
There have been false go-to-war signals transmitted by other nations but so far we haven't blown anyone up by accident.
Also the military has tunneling technology that uses strong lasers to melt any kind of rock. The design allows a machine to tunnel without have debris to extract or move. The laser melts the rock and creates it's own tunnel walls as it goes. Super strong and in some cases is vacuum evacuated to allow electric vehicles to move at very high speeds for very long distances. Hence the underground military bases like the supposed underground city beneath DIA Airport here in Colorado.
The ULF and laser tunneling technology is not a secret but what actually goes on beneath our world is a mystery I wish I knew more about.
The only solution I could see is moving to an area where these sounds aren't heard.
If anyone is interested in some interesting theories check out the "Hollow Earth".
Exofriends: Telos: an Introduction to The Story - 7/19
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