At first Rey starts to ask if Law has some Navy experience, but then she remembers.

Yeah, right. Pirate. Of course he has some experience with traveling across large bodies of water. But now she's curious about something else.

"You have experience with actual submarines?" She almost sounds impressed. "Who knows, it might be on the agenda soon, since it's not like Tranquility's mopeds are going to be much use here. Subs would be a step up, anyway."

Everything isn't so far apart anymore on the islands themselves, and Tranquility has provided them with means of faster transportation in order to retrieve Hope's orbs.