Haiyin, a female PhD in aquaculture, gives up her million-yuan salary and returns to a fishing village on the verge of poverty. Her first demand is that the entire village stake their old fishing boats on a daring 30-million-yuan deep-sea cage farming project. The veteran fishermen call her crazy, the villagers fear losing their last remaining assets, and even the banks refuse to lend her money. But when violent waves surge through Black Snail Bay, she ventures into the deep sea with an underwater probe. Once a map of the seabed is transmitted back, the fate of the entire village is completely transformed.