It's just a Chinese version of 'The Story'. No matter where you live, soon after moving in, some local will tell you 'The Story'. It goes like this: People have disappeared in (enter body of water of your choice, especially if it has a spillway, or other type of dam), and when they sent divers down to look for the bodies, they refused to go back down because they saw a huge catfish that tried to eat them.

It's nice to know that 'The Story' is even told in Asia.

See? We're not all that different, after all. We should be looking for other Common Grounds, to help us all get along.