Outskirts of Gotham
"Okay, Art, I'd like you to meet someone," she said. "Also, I think you ought to know that it's technically possible that Lex Luthor just, um, kind of started a chain of events that would normally potentially wipe out H. sapiens entirely, but the way he did it, might hit your people and everyone else underwater much, much harder."
She took him to Seabase.