posted on Jan, 24 2013 @ 11:12 PM
Here are some examples that I know of.
The Kimbleton Underground Research Lab, built inside the Kimbleton Lime Mine in western Virginia, sits at approximately 7,000 feet underground.
Although most of the lab modules are located only 1,700 feet down.
SNOLAB in Sudbury, Ontario is an underground physics lab which is approximately 6,800 feet underground. It was built inside the former Creighton
DUSEL (Deep Underground Science And Engineering Laboratory) in Lead, South Dakota is another underground physics lab which currently exists at about
4,000 feet underground. It was built inside the former Homestake Gold Mine. There were plans to extend the lab down to 8,000 feet but I believe this
The Soudan Mine Underground Lab in Minnesota stretches down to 2,341 feet.
The WIPP (Waste Isolation Pilot Plant) used to store radioactive waste near Carlsbad, New Mexico is approximately 2,150 feet down.
Now these facilities are deep for a reason. Wherears the average high security bunker is usually not very deep at all. They range anywhere from 40
feet down to 100 feet down. Plenty of coverage to protect from harmful levels of radiation.