Under the Deep Sea

"The water from the Sealine flows downward to cause the lower level water to rise? How is this possible?"

Tilly pondered for a while. "So when the tide falls, will the water flow backwards?"

"Good question." Thunder clenched his fists excitedly. "Afterwards, my fleet stayed near the Sealine for two weeks, until the tide fell. During that time, we tried all kinds of ways to break through the Sealine, and the most amazing part was sailing on the Sealine itself—do you know what kind of feeling that is? To outsiders, it seemed as if we were stuck to the face of a cliff, with our sails completely paralleling to the ocean, as if we could fall down at any second. But we couldn't feel this on the boat at all, and it was like the Courage was sailing in a narrow river, with the vast wall of seawater on one side, and the expansive sky on the other. Of course, we had to wait for the water to slow down to do this, otherwise even the Magic Servant couldn't protect the boat."