It's a fantasy role-playing game.

DM: You are Caleb Widogast, a human wizard . You are the member of the famous group of adventurers. Previously, They get into the rowboat, Fjord and Jester swimming alongside and Nott trying unsuccessfully to hide from them before they leave. you turns Frumpkin into an octopus and throws him into the water.
DM: All right. About 30 or so feet up, the water breaks. There's a surface, though there is no light. Does Frumpkin's octopus form have darkvision?
Player: Darkvision, yes.
DM: Yes. Okay. So does Frumpkin--
Player: Yeah, crests up and pokes his eye nubs out of the water.
DM: Okay. Frumpkin floats there on top for a second, and you can see now where it emerges--
Player: Looking for anything moving here, while we're up here.
DM: There is another set of bars right at the top of that tunnel, that Frumpkin has pushed and squeezed through to come through. So there's bars, like a grate, on the way in, and then a grate once you curve upward into the tunnel.
Player: So he's come through a second set.
DM: Come through a second set, and then breaks the surface of the water about a foot beyond that. And now you can see, it is closed off mostly, except for a tunnel that continues deeper in the same direction that the lower tunnel went. And that one continues on for a bit.
