There is little information to be found around this, but here you can read a little (in norwegian).
There is still activity on the base.
In addition, it existed / exists a similar, but smaller, NATO base north of Hessdalen – at mount Bringen (1042 m.) in Haltdalen.
Here are some pictures of the plant;
This page provides information about how it was built huge underground plants in relation to the NATO bases:
From google earth:
(The red line shows the direct linear distance from Hummelfjell to Bringen).
Haviks book (The UFO phenomenon, 1987) describes several times an elongated object with two yellow lights behind, and a little red light in front. Something like this:
Direction and altitude (according to the detailed descriptions in Haviks book) match remarkably well with the calculated linear distance between the two NATO bases – Bringen and Hummelfjell.
Was this testing of exotic propulsion? Was it a training "camp" of pilots and personnel to control these vessels? Or maybe it was patrolling / supervision with the other "exotic technology" that were/are placed in Hessdalen?
The other "exotic technology" - in the form of balls of light, etc. I think probably involves testing / development / training acc. electronic warfare, and electromagnetic weapons.
Can Hessdalen be the site of secret experimentation with "exotic technology" under the control of NATO?
Observation reports from Hessdalen in many cases indicate that we are dealing with an exotic form of propulsion. Among other, it is described non-aerodynamic maneuvers, such as "angle turns," "stair-like movements" etc. This indicates a type field propulsion / "anti-gravity."
We are not talking about any kind of "advanced planes," if someone would think that was the case.
In a series of posts on this blog, I have tried to show how there are indications that the UFO phenomenon can be traced back to Germany and the second world war. Probably the technology was imported into the United States with German engineers and scientists through "operation paperclip" and then disappeard into various black projects.
I have also attempted to argue that a form of "nuclear propulsion" may be the "missing link" between conventional propulsion and more spectacular, electromagnetic, "anti-gravity" propulsion systems.
It is not inconceivable that the United States - through NATO – (with help (?) of Norway) – would want to test this type of technology on Norwegian soil. Remote mountain areas like Hessdalen would be perfect for this purpose.