It's a scam to attract tourists, there was a news report a while ago about it.

Speaking of lake monsters, allegedly there's something of a monster in Xinjiang's 喀纳斯湖，清朝地方县志里都有记载的，欧上次去也好像看到了什么东东

那个湖水真得很黑，但是很干净？

真的很难想象。。