[ They'll have to do their best to slurp up their food while filter out the water or something, or maybe watch the mermaids and see what the eating etiquette is.

An eloquent "uh" would be Minato's kneejerk response to what he thinks of this place, as he has opinions about this place, but not all opinions he wants to voice outloud in earshot of people's whose home he's talking about. ]

...Different than what I expected. When I heard it was going to be underwater, I thought it'd be like those caves from before. ...I wonder if those mermaids know the ones here?