On a stormy night when debt collectors come knocking, Lin Hai stands up for his girlfriend and takes on a massive debt of 300,000 yuan. With savings hidden inside the keel of an old boat and a secret map of deep-sea fish shoals, he pilots a modified old vessel and fearlessly ventures into a deadly reef zone. After accidentally salvaging a national treasure and turning it over to the state, he outsmarts a smuggling gang, builds a deep-sea ecological ranch, and braves a typhoon to carry out daring rescues. He breaks the overseas monopoly on fish fry technology and blazes a deep-blue path for Chinese fishermen with science, technology, and burning passion.