GMMichael
Guide of Modos
Irony: the sub is located in the territory formerly known as Montana.
Something interesting: the still-accessible portions of the sub have been converted into a shrine for the local god, Ramius.
Something useful: a dictionary. Because... knowledge is priceless after the apocalypse.
Something dangerous (blue?): the cult references "treasure" deep in the sub. But the further you delve, the stronger the radiation.