This really whacked me... I've been thinking about some of my own thoughts and conclusions from before and some of the remarks of @Ephraimite regarding Dante's vision of hell / the cavern world... and also the Jain cavern map we saw previously... It really does appear as though Agartha/Shamballa is Satan's ruling city in a juxtaposition with Eden where also Mount Meru may be.
And indeed you are right about the Jain swastik / Pueblo + Navajo swastik connection showing a very direct cultural connection:
Jain:
Navajo Rug (for sale by Leonard Brown):
Hmmmmmmmmmmm.