Alhaitham was visiting the surface for one simple reason. To read. The pages of books would become damaged when underwater, and the text unreadable. So the only option was to read them above the waters.

That was when you, the notorious pirate of Sumeru, saw him from your ship. You noticed his merman tail first. It was a long tail, with light turquoise scales that glistened beneath the sun. They seemed to have a faint, iridescent orange tint to them.

The sight was mesmerising.