Link sailed to Windfall and made his way to Zunari's shop.

"What can I do for you, good sir?"

"I heard you have some diving gear. If so, then can I have it?"

"You can rent it out. By the way, how's the heirloom?"

"The sail? I don't know how I'd manage without it."

"That's nice. Here's the gear. Please be careful with it."

"What? Is it an heirloom too?"

"If you're going to be a smart-aleck, then I can just take it back."

"Okay, okay. Fine. So how much is the fee?"

"200 Rupees."

"Eh..."

"Don't have enough sir?"

"Sadly I don't. Come on, this is important. I helped you set up your shop; the least you could do is help me out. I'll be really careful with your diving gear. I'm just going to Shark Island to visit the king there."

"SHARK ISLAND?! It'll get all chewed up!"

"No it won't. In fact, they're the ones who suggested I come here."

"Fine... but if I see a single scratch on it that wasn't there before, it'll cost you 500 Rupees!"

"Okay. Deal."

Link left with the gear and headed back to Shark Island.

"Okay, I got the gear. Now what?"

"After putting on the diving gear and going underwater, you'll find a cave. Go enter that cave. It's dark, though. Follow the eels but be careful not to let them shock you."

"Got it."

He follwoed the directions and finally reached the Shark King.

"Welcome human."

"I'm here about the thief. I understand that he took something important of yours but... what was it?"

"Poseidon's Orb. It controls the tides much like the Wind Waker can control the winds."

"Okay. But the Wind Waker is a baton that conducts. How can an orb do anything?"

"If one knows how to use it, then it can do a great bit. We sharks suspect that this person has magical abilities as he was able to sail at an unnatural speed. The winds weren't unusually strong anyways. Also, some of my people were paralysed for a short period of time. But nevermind. What's important is that if this man figures out how to use the orb, the world of land could be in real danger. Or the world of the sea could be drained and the we'd be in danger."

"Okay, I'll get it back."

"First, you need to go after the Book of Mudora. I heard that it was somewhere around or on Dragon Roost Island."

"Thanks."

"We're counting on you, human!"

Link set sail for Dragon Roost Island in search of the book.