I found out about the painter via this YouTube video about the Apocryphon of John, he’s the guy who did the background image:
https://m.youtube.com/watch?v=aSp5TYEDYwU
Then I found this website dedicated to him and it has a gallery of his work:
https://roerich.org/
Then months go by and I’m listening to this Jay Weidner video about hollow earth, and he made the claim that FDR sent Roerich to Tibet to investigate Shambhala. I get different answers as to what Shambhala is when I search it, but Jay in the video says that it’s, according to legend, a location where there’s an entrance to the hollow earth. Other things I’ve found don’t seem to go that far but that’s what Jay said.
https://m.youtube.com/watch?v=P2Vw_3U6bX0
They get into Antarctica as well.
So I started looking into this Roerich connection to FDR and I found this article, which goes more into his history and apparently his connection to FDR was through Henry Wallace (future FDR VP). He has connections to Blavatsky and a lot of other big names back then.
https://www.newdawnmagazine.com/articles/nicholas-roerich-the-sacred-union-of-the-east
It was just some crazy connections that fell into my lap, figured it may be interesting for anyone studying WWII mysticism.