So, as a final update:
They have suspended the search for Paul. The area his vehicle went into has proven too difficult to continue safely searching and the agencies involved have exhausted all resources they have available.
At this point, there's not much more we can do, unless we wanted to try and continue to search on our own. But the area is part of state park land, so we would have to get permission to continue, plus permitting from various agencies. And even then, if we had someone dredge the area and then have divers go back in, we still may not find him. And I know he would not want my parents to bankrupt themselves just to try and find his body, and I told them as such.
So we will have to live with that. And I think that's when it really hit me, when I realized that my parents won't be able to have that closure, to be able to say that we at least got him back. And that hurts me the most. It just fucking hurts.