Nantianmen: Heartbeat of Earth and Moon

In 2061, Zhuyue 7 disintegrated in low-Earth orbit. Twelve subsystems, all display normal. Ling Yue doesn't believe in coincidences. He found a string of zero-filled gaps in the last two minutes of data from the black box—a signal on the far side of the moon jumped in amplitude at the same moment the spacecraft disintegrated. Frequency 4.71 Hz. Very low frequency. Not a natural phenomenon. It comes from two kilometers below the moon's surface and has been going on for more than two thousand years. He was removed from the investigation team, placed under house arrest, and had his authority revoked. But he didn't stop. Even stranger news came from the outpost on the back of the moon: the hatch opened and closed on its own without anyone around. The oxygen valve starts and stops repeatedly. The log is erased. A resident scientist stood at the end of the corridor for forty minutes without moving his eyes once. And in the shadow of the outpost's outer wall, a door that does not exist on the drawing is welded. It was built earlier than humans set foot on the back of the moon. This is not an accident investigation. This is the first time humans have discovered—— In the heartbeat of the moon, something echoes. Completed with 79 chapters, updated steadily every day. There is no practice, no system, no harem - just the precision of aerospace engineering and human choices in the face of the unknown.