Though Damian is aware of Rapture's existence, he's never been down to explore. Knowing he'd need a plan to get around whatever guard should be stationed there, due to the ridiculous age limit that would deny him access regardless of escort, he's shown remarkable patience for following the rules, to not draw attention to himself and keep the family secret secret.

He's just about the only one from their world who can say as much.

"Have you already run into your crazy ex-partner, then?" he asks, scoffing. Todd's been nowhere to find topside tonight, which means he's probably underground. Damian has only a vague idea as to Rapture's size, but he has little doubt that those two found each other, if only briefly. "You have to admit, Grayson has better taste."