[ It looks like, toward the bottom of the water there's a little structure. He tugs him toward that, and once he finds an entrance, he tugs him inside.

It looks... as though it's furnished? In a way, at least. Comfortable places to rest or sit, like a secret hideaway. ]

I suppose... they made things like this for people who are afflicted with the mer card.

[ Since he's a mer... it seems he's able to communicate beneath the water. Or at least he believes he is.]