Zzzap has trouble seeing people inside ships

Richard tugged his tie straight. “People?”
Barry plucked a mushroom out of his bowl and swallowed it. “Not sure. A couple hundred? Six, maybe seven hundred, tops. Some of them were down belowdecks, and all the metal and water kind of screws with my vision.”

Excerpt From Ex-Isle, pg 74
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017