Epistolary-which is the literary work in the form of letters.
An appositive is a noun or noun phrase that renames another noun right beside it, it can be short or long combination of words here's an example: The insect, a cockroach, is crawling across the kitchen table. i hope this helps you :)
In my opinion, there are two possible reasons.
First, the government probably does not think these guys are any kind of a threat to them. I mean, so what if there are some people out walking around when no one knows they're there? It's like the thing about the tree falling in the forest with no one around.
I would mention how this would affect the readers way of living. Perhaps how sea levels are rising and such,
