There was a man named Tu Yong in Jiang'an who was a fisherman. He was very good at water, and could lurk underwater for an hour or two. Everyone who knew him called him a "water ghost." This Tu Yong was rich and often asked people where there were sunken ships or treasures lost in the river, so he could visit and see if he could find any property. Once, he heard that a ship had sunk in a lake, but it had not been salvaged so far. There should be something valuable on the ship. Tu Yong planned it several times and went to the place to investigate in person, and it was indeed true. After working for several days, he finally confirmed the exact location of the sunken ship.

After several days of salvage, Tu Yong did find a lot of property, but this was not enough to satisfy him. During the last investigation, Tu Yong saw a large boulder on the side of the sunken ship. The stone was covered with aquatic plants, so he couldn't see it. However, a thick iron chain was tied to the exposed part of the stone surface, which seemed to be very old. Tu Yong probed along the iron chain and found that the large iron chain actually tied the entire boulder, and used a large lock at the end of both ends to lock it. Tu Yong didn't know what it was for a while, but seeing that the lock was unusual, he carefully checked it, and the material made him ecstatic.

It turned out that the pair of locks were one gold and one silver, and they were about a hundred catties in size. Tu Yong didn't care what he did, so he spent another two or three days seeing the golden lock first. As soon as he took off the golden lock, the undercurrent at the bottom of the lake suddenly surged and the earth trembled, and the lake water began to be turbid. Tu Yong was shocked and hurriedly surfaced to hide the golden lock by the lake for the time being. After everything was calm for a long time, Tu Yong still had some doubts in his heart. Seeing that it was still early, he wanted to dive down to find out. By this time, the lake water was much clearer. Before Tu Yong reached the boulder, he suddenly saw the stone move from a distance. Looking carefully, it turned out that the iron chain was tied to a behemoth, which looked like a rhinoceros with horns and eyes.

When Tu Yong was panicking, the monster seemed to have seen him coming, and saw that he could squirm its body slightly, but could not move freely. He looked in the direction of the silver lock several times, and seemed to be asking Tu Yong to take off the silver lock together. Seeing that he dared to stay, Tu Yong quickly got out of the water and took the golden lock home. After going back, Tu Yong saw that everyone was discussing the earthquake during the day, and he was very uneasy, not knowing if these were related to the monster at the bottom of the lake. That night, before he could fall asleep, a man in white suddenly came to see him. The man in white said to Wang Zhao, and he asked Tu Yong sternly why he wanted to steal the golden lock.

When Tu Yong heard this, he felt very guilty and hesitated to say no, and Wang Zhao told him that thousands of people would die because of your self-interest, and you will not be able to escape! When Tu Yong heard what he said, he didn't look like an ordinary person, so he admitted what he had done. Wang Zhao sighed after listening, I came from Xuzhou just for this matter! Tu Yong asked him what kind of monster was underwater, and how did he know that he had stolen the lock? Wang Zhao replied, "Is there anyone other than you who can do this? He also said that this matter has to start hundreds of years ago. At that time, my master Shen Daozi had not yet entered the Immortal Book. Once, he captured a chaotic stone rhinoceros in Bozhou and passed through Jiang'an when he returned to Xuzhou. At that time, Jiang'an happened to be flooded, and the whole city was submerged. My master saw that the flood was too bizarre, and after several searches, he found the sea eye connected to the sea in Jiang'an.

He then left the stone rhino to suppress the sea eye, and struck the silver lock to lock its shape, and hit the gold lock to lock its god. Now that the gold lock has been opened by you, the stone rhino has awakened, and is already planning how to escape. If you let it escape, the sea water will gush out and flood the whole city. At that time, it will harm more than tens of thousands of people! When Tuyong heard this, he was shocked and hated himself for making a big mistake. He knelt down and begged Wang Zhao to save him. Wang Zhao said, "I brought the golden key left by the master." Is the lock still there? Tuyong replied that it was still there, but it was destroyed by itself After saying that, he took out the golden lock. It turned out that Tuyong took down the golden lock and had to see off a section to pass through the iron chain. This section is not light, how to remedy it?

After Wang Zhao opened the lock, he said to Tu Yong, "This matter is caused by you, and you should remedy it." Even if you sell your family property and ancestral business, you have to use gold to make up for the broken lock! Although Tu Yong was reluctant to give up, when he thought that his fault was his and thousands of lives were involved, he had to sell the property on the sunken ship and pawn all the valuable items in the house, he barely collected enough gold, and after melting, he repaired the short lock. After listening to Wang Zhao's order, he sneaked into the bottom of the lake to lock the stone rhino again. Seeing that he sincerely regretted and recovered, Wang Zhao did not punish him, but only warned him not to tell others about this matter. After this incident, Tuyong was unwilling to survive in the water, so he followed Wang Zhao's suggestion and went to Zhenjiang to become a Taoist priest.