The merman(?) observes the drone from a distance, at first, circling around it a few times to get a good look. After a couple of circuits, he swims in closer and starts poking at it.

Tony leaves him to it – it doesn't look like he's going to damage it. Tony thinks about calling out a greeting, but the merman is a little far away to talk to, and Tony's not sure how well he'd be able to hear him under the water, anyway. Either he'll get bored of the drone and swim away, or he'll want to know more about it and start a conversation himself.

Or— okay, or that.

"Hey!" Tony stands up, waving his arms indignantly. "Hey! Come on, man, that's mine!"