Only one city? In the entire world? [Like the Lunar Palace on the Moon? Maybe his world was in decline, too?]

It's quite brilliant, for something created by humans! Nothing like Lunarian technology, but it's a start, right? And I'm certain you'll be able to make even more advances in the future.

[Gently, she closes the lid on the device.] I do wonder, though, what is the purpose of providing the new arrivals with these devices? Why provide us with a means of communication if the natives so fear us? Would they not worry about us plotting against them, or something like that? [Not that Rosa herself puts any stock in such a notion.]