After re-reading the crumbs starting from the 1st one and thinking about things if the dates line up a year in advance, it really sounds like we might be going to war with SA.
Keystone is a central stone at the summit of an arch, locking the whole together.
I was playing around with my rudimentary graphic and realized the first part of SATAN is SA (saudi arabia) the middle is the cross - the keystone above the pyramid - the last part of SATAN is AN. I looked up a list of countries to see if any started with AN and got Antigua. Jaw hit the floor and started breathing heavy when I realized Epstein Island is there.
NOTABLE?!
I dunno - they appear to be close enough to me. How easy is it to find an island to create a underground representation of hell exactly where you want it?