[ That makes him grin, and he waves his hands in theatrical relief, as if in concession or congratulations for asking a question he can actually answer with confidence. ]

Hah. Wrong. I know that much for a fact. Everything good is above the surface~

[ He gestures vaguely around them, smirking. ]

Believe me: Life undersea seems really boring. I mean, life on land can be boring, too, don't get me wrong — but at least on land you can jump off stuff if you're bored. Y'know, gravity~? Undersea, you just— I dunno what— blow bubbles, I guess? Hah!

[ He thinks he's making a cheeky joke, but really he's revealing so much information about himself between the lines. Most concerning being that apparently when he's bored he just launches himself off cliffs or something, it sounds like...? No wonder he complimented her on falling out of the tree...! ]