“Seth material” search engine (Jane Roberts)

There were various escalated systems, some conveying people on foot, some conveying goods. It was not practical to construct such tunnels to the many outposts, however, which were fairly small communities and relatively self-supporting; some were a good distance away from the main areas of commerce and activity.

I should perhaps mention here that some of the caves, particularly in certain areas of Spain and the Pyrenees, and some earlier ones in Africa, were artificial constructions. Now these people moved mass with sound, and, as I told you earlier, actually conveyed matter through a high mastery of sound. This is how their tunnels were originally formed, and it was also the method used to form some of the caves in areas where originally there were few. Often drawings on the cave walls were highly stylized information, almost like signs in your terms in front of public buildings, portraying the type of animals and beings in a given area.