My guess it's a deep shadow company or a secret dept. of Skunk Works.....
Folks who have studied the topic know the names of at least some of the contractors involved—it is a close match to the largest defense companies.
Some sources indicate that the large construction companies who built deep underground military bases may have some of the secrets as well.
When the mass media tells you the action is “up there” the rule of opposites says that most of it is probably underground.
Within these companies there is very intense compartmentalization—most employees would have no clue what is happening.