"We don't know, we were on our way over when we hit a big wave, we got knocked over by one straight away, and after we climbed back on board, we rushed over and didn't go back." Da Mao explained.

"What big waves can there be here? How could it knock the boat over?" He Xiaosheng found it unbelievable.

Today, the wind and waves are calm, and as far as the eye can see, the lake is as smooth as a mirror. Not to mention the big waves that could knock over the boat, there wasn't even a ...