Ling Yunge, 27 years old, is the youngest female diving instructor in China. She can hold her breath underwater for four and a half minutes and is familiar with every reef and ocean current in the South China Sea. Three years ago, her father, a marine geologist, disappeared mysteriously during a deep-sea scientific expedition, leaving only a incomplete diving log and countless unsolved mysteries.
Gu Shen, 32 years old, is a former elite member of the Marine Corps' frogman unit and is currently the captain of the ocean rescue team. He has top underwater combat capabilities, but he is burdened with the psychological burden of a human life. During a deep-sea rescue mission, he met Ling Yunge on a narrow road.
From tit-for-tat to life-and-death dependence, they repeatedly tested each other's heartbeats between the deep sea and the shallows. A marine pollution conspiracy involving multinational corporations, a sample of deep-sea archaea that can cure cancer, and a deliberately concealed murder truth - together they will dive into the deepest trench and into each other's most secret past.
"You know, in the deep sea, the most dangerous thing is not the shark, but the fear of not being able to see the bottom." He said to her.
"Then remember," she wrote on the underwater writing board, "I am your human anchor."
This is a story about the deep sea, redemption and love. Some people's fate is destined to be seen clearly at the deepest seabed.
