Zzzap can’t see Nautilus underwater

“Barry, where did he go?”
“What? He dove off the side. Launched himself right over the fishing boat and hit the water.”
“Crap. Can you see him?”
The wraith flitted a few yards up into the sky. Zzzap’s head swiveled back and forth across the ocean. “No,” he said. lThe water makes things tough, especially with his body temperature being on the low side.”

Excerpt From Ex-Isle, pg 538
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017