Look At Blocked Passage.

Although, the fact that his secret has been hastily patched over upsets you. You take a minute to realize that having an open crevice underneath an island that is now in the middle of the ocean with its connecting half being completely gone would spell for a very watery disaster for everything in this room.

Matter of fact, you feel you’re stepping on damp ground when approaching the wall here. Best not to mess with it.