When a storm swept across the Pacific Ocean, marine biologist Lu Shiyan discovered a mysterious man - Lin Zhihan - who was swept up by the huge waves on the deck of the scientific research vessel. His body was covered with fine silver-blue scales, his fingertips had translucent webs, and his gills were still opening and closing weakly. He was obviously not an ordinary human.
Lu Shiyan took the risk and hid him in the seawater chamber of the laboratory. Lin Zhihan lost his memory after waking up. He only had an instinctive reaction to the low-frequency sound waves emitted by the deep sea, and could not leave the seawater for a long time. Lu Shiyan named him "Zhihan" and tried to help him find his identity, but this led to the pursuit of the secret organization "Haige" - they believed that Lin Zhihan was a survivor of the legendary "Pacific Bottom Civilization" and wanted to extract his genes to control the deep sea.
In order to avoid pursuit, Lu Shiyan took Lin Zhihan and sneaked into the depths of the Pacific Ocean. On the way, Lin Zhihan gradually awakened his abilities: he could communicate with giant whales, travel freely in the 10,000-meter-deep sea, and sense geological changes on the seabed. In his fragmented memories, a glowing underwater ancient city and a disaster that destroyed civilization always appeared.
While evading the pursuit of the "Haige", the two teamed up to prevent a tsunami caused by an undersea volcanic eruption, and gradually got closer to the truth about Lin Zhihan's life experience - he was not a "survivor", but a "new human being" cultivated with ancient genes by the civilization at the bottom of the Pacific to continue the fire. Lu Shiyan's family is inextricably linked to the scientific expedition team that discovered the ancient underwater city a hundred years ago.
