Water flows from the sea line into the sea line causing the lower water surface to rise? How is this possible?

Tilly thought for a while, "Where is the low tide? Will the sea water flow backward?"

"Good question," Thunder clenched his fist excitedly, "Then my fleet stayed near the sea line for half a month until the tide receded. During this period, I also used various methods to cross the sea line. The most amazing thing is to sail on the sea line. Do you know what it feels like? Outsiders think we seem to be stuck on a cliff, and the sails are completely parallel to the sea surface and may fall down at any time. But we on the ship cannot feel this at all. The Courage is like sailing on a narrow river several meters wide, with endless walls of sea water on one side and wide sky on the other. Of course, we must wait until the water flow slows down before doing so, otherwise the magic servants will not be able to protect the hull."

"This... is simply unreasonable." Tilly felt a confusion in her mind. If the narrator was not Thunder, but other explorers, she would have thought that the other party was boasting randomly.

"I think so, but I believe in my eyes more than usual." He continued, "half a month later, the tide began to fade, which was consistent with the rise and fall of the Shadow Islands. The sea water did not flow backwards, and it slowly retreated, and the sea line changed from several meters high back dozens of feet again."

"You mean, the extra sea water just disappeared out of thin air?"

"Maybe, but it may also flow to other places."

"Where can it flow?" Tilly said with his forehead, "The tides of the Shadow Islands rise and fall, while the fjord islands are much more gentle. When it reaches the shores of the four kingdoms, there is almost no obvious change. Isn't this disappearing out of thin air?"

Thunder pointed at his feet.

She sighed, "I remember you said that the water surface in the shadow sea falls so quickly, just like a huge hole at the bottom of the sea that is swallowing the sea water. But no matter how big this hole is, it will be filled for a few years."

"This is just my guess. After all, no one has seen what the real seabed looks like, but... there is one thing I care about."

"What?"

"That's why is this ocean we are in called the whirlpool sea?"

Tilly was shocked when she heard this, then shook her head and said, "Impossible, this idea is too crazy. If the drainage of the underwater cave can cause a vortex, how could we not observe it? And this name came out hundreds of years ago. Who knows what the narrator was thinking at that time?"

"Indeed, I have done a simple experiment. The water must be shallow enough to see the vortex, and we do not have the ability to go deep into the sea." Thunder smiled mysteriously. "But we don't, it doesn't mean that the witch can't do this before. But when you told me that there was a witch empire that spread across the mainland more than four hundred years ago, I realized that the name is likely to have been passed down from that era."

"But I'm a witch," Tilly shrugged, "and there is no witch on the Sleeping Island that can do this."

"I know one."

"What?"

"This witch is in the fjord, but she hasn't been in contact with humans for a long time..." Thunder sighed, "She was once a friend of a capable deputy in my expedition team. Since she woke up as a witch, she has said goodbye to the land forever. Now she can only hear her melodious singing when the channel fogs, and you should have heard her story."

"The mermaid who guides the navigation road... are you talking about the protagonist in this rumor?"

"That's right," Thunder nodded, "Although I don't know if I can get her help, I have to try it. Maybe my old friend Margaret needs help me."

"So that's it, then you have to hurry up," Tilly said with a frown. "It seems that someone in the fjord business wants to fight a mermaid. A month ago, Maleficent received several commissions for hiring witches to capture mermaids. Honey specially sent a messenger to ask me for instructions, but I rejected it."

"Her singing is regarded as a symbol of good fortune and peace by all fjord sailors and explorers. These merchants are simply crazy," Thunder asked in a deep voice, "Can you tell me who they are?"

"Maleficent Curse should not reveal the identity of the customer, but..." Tilly drew several names in the air, "This was something you saw by yourself." Since the other party was a witch, as the leader of Sleeping Island, she could not sit idly.

"Yes," he raised his lips, "they will be retribution."

The two met and smiled, and Thunder then said, "This time I came to you. In addition to the new expedition commission, I also need your help."

"Tell me."

"That's right. When I came back, I heard that a new ship was introduced by the Fenyue Bay, which could sail without relying on wind and was much faster than sailing ships. I asked someone to inquire about it in detail and learned that this ship was actually made in the border town," Thunder said frankly. "If I want to continue exploring the waterline, I must have larger and faster ships, otherwise I will have to be pushed away by the countercurrent when the wind is not good." He took out a letter from his arms, "Money is not a problem. The faster the ship, the better. Can you give me this order letter to him?"

Tilly quickly understood what the other person said, "Don't you want Lightning to know?"

Thunder Ting said helplessly, "If she knew, she would definitely insist on going with me. No one knew anything on the waterline. I can't take her on the adventure."

But she is already a qualified explorer. The remains of the stone tower hidden deep in the hidden forest were her discovery. Tilly thought so in her heart, and finally nodded, "I understand, I will help you contact Roland Wimbledon for the time being."

"Thank you, Your Highness."

After Thunder left, Tilly pondered for a long time and moved out the ancient books that had been in the ruins of the Shadow Islands. Perhaps she could find clues related to sea lines and tides here. According to the method taught by Agesha, she turned the magic power in the shape of the characters, and the corresponding meaning automatically emerged in her mind as if she was not reading books, but the books were confidering the content to her.

Some ancient books describe what the recorder saw and heard in the wilderness, some like navigation logs, and some mentioned the reconstruction plan of the Federation. The more she looked down, the more she felt confused. The contents were not connected, nor did it look like it was written by one person. None of them mentioned the sea line, the undersea spire, the lookout glass and the huge stone door in the mirror, which was completely different from her previous expectations. I thought that as long as I could understand the text of the Federation, I could uncover some secrets in some ruins, and even find out the truth about the rapid rise and fall of the horizontal surface of the shadow sea. But now, she was more like looking through a bunch of miscellaneous notes.

Wait... Patch together everything? A lightning flashed in Tilly's mind. She spread out three navigation logs together, and carefully checked them again. The time recorded on them was very different. Some were even decades apart, and the routes were different, from the waters near the mainland to the fjords, as if someone collected these things one after another and stored them in the ruins.

When this thought came out, she couldn't help but feel a chill rising behind her.
Chapter completed!