This book revolves around Lu Qian, a saturation diver who went through many arduous missions. Three months ago, he was stranded at a depth of 380 meters in the blue ocean for four hours due to equipment failure. Lu Qian had hallucinations in the deep sea - he heard a voice that shouldn't exist. It seemed that only by returning to the blue loneliness of the deep sea could he escape a sense of helpless weightlessness.
Until he received an invitation from his old friend Duan Huai to land on an isolated island in the South China Sea and met Su Yulan, a physicist who built a "weightless cabin" on the seabed. She built a "blue heart" thirty-seven meters under the sea. It was a listening sphere to track a sound that could only be heard at the bottom of the sea, and that sound was the same sound that mainland China had heard when it was 380 meters away.
On this island, the two souls confirmed that the weightlessness was not falling but finally finding the anchor.
Purpose: To maintain self-awareness and perseverance