[As he's listening, the stray thought of 'Perhaps nobody's tried hard enough' crosses Dorian's mind, but he dismisses it after a moment's consideration. As tantalizing as the secrets of the city's boundaries are, the very idea threatens this small slice of paradise where Toby's alive. No investigation is worth endangering either of them accidentally tripping into some secret that sends either of them home.

Thankfully, the idea of a modern Atlantis is interesting enough to grab onto, instead.]

Under the water? [He blinks.] So, under the waves of that beach out there, [he points at the window of the bathroom] there's an entire city that people here can get to?